Why Many Neurologists Recommend a Second Opinion After an ALS Diagnosis, and What It Reviews

The appointment lasted forty minutes. Somewhere in the middle, a neurologist said three letters, and after that the rest of the conversation arrived as noise. On the drive home, one question kept surfacing: are they sure?

That question is not denial. It is, in fact, exactly what many motor neuron specialists hope a newly diagnosed person will ask. A second opinion after an ALS diagnosis is standard practice in most neuromuscular centers, and the request rarely offends the doctor who made the first call. ALS is diagnosed by pattern and by exclusion, not by a single result that lights up on a screen, and a careful second reviewer sometimes finds a different, treatable explanation.

This explainer walks through what that review actually examines, who tends to benefit most, how the weeks around it usually unfold, and where the honest limits of the evidence lie.

What a second opinion after an ALS diagnosis actually reviews

Start with what ALS is. Amyotrophic lateral sclerosis is a progressive disease in which the nerve cells that control voluntary muscle, called motor neurons, gradually stop working and die. There are two sets: upper motor neurons in the brain and brainstem, and lower motor neurons in the brainstem and spinal cord. ALS damages both, which is why the examination findings are so specific when the picture is complete.

A second-opinion neurologist is not simply re-reading a report. They rebuild the case from the ground up. The review typically covers four things:

• The story: where weakness or slurred speech began, how it has spread, and over what number of months.
• The examination: looking for the mixed signature of brisk reflexes and stiffness (upper motor neuron signs) alongside wasting, twitching and weakness (lower motor neuron signs) in the same body region.
• The electrical studies: electromyography (EMG), a needle test that records muscle electrical activity, and nerve conduction studies, which measure how fast signals travel along nerves.
• The exclusion work: MRI of the brain and spine, blood tests, and sometimes spinal fluid analysis, all aimed at ruling out conditions that mimic ALS.

According to the National Institute of Neurological Disorders and Stroke, there is no single test that establishes ALS; the diagnosis rests on this combination of history, examination and investigations, with other diseases excluded. That is precisely why a second pair of eyes carries weight. The reviewer asks whether the evidence meets established clinical criteria, whether the spread of signs over time is consistent with motor neuron disease, and whether any abnormal result has been given too much, or too little, importance.

Why neurologists themselves recommend a second opinion for ALS

Doctors do not usually ask to have their work checked. In ALS, many do, and the reason is structural rather than personal.

ALS is uncommon. The CDC’s National ALS Registry estimates roughly 5 cases per 100,000 people in the United States, which means a general neurologist may see only a handful of new cases in a career. Early in the disease, symptoms are often confined to one limb or to speech, and the full pattern of upper and lower motor neuron involvement may not yet be visible. A specialist who sees motor neuron disease weekly develops a feel for its tempo and distribution that is hard to acquire any other way.

The second reason is consequence. An ALS diagnosis changes everything a person plans for, and it also closes doors: once a chart says ALS, clinicians may stop looking for alternative explanations. If the true cause is a treatable inflammatory neuropathy or a compressed spinal cord, that delay matters. Conversely, a confirmed diagnosis unlocks disease-modifying therapy, genetic counseling and clinical trial eligibility, several of which have time windows.

The third reason is simply good medicine. Mayo Clinic’s guidance on ALS notes that the condition is often diagnosed only after other conditions have been ruled out, and that this exclusion process takes time. A second opinion is a formal way of making sure that process was thorough. Many neuromuscular centers build it into their pathway automatically, and some first-opinion neurologists will suggest it before the patient thinks to ask.

None of this implies the first doctor was careless. It reflects a disease that is diagnosed by judgment, and judgment is strengthened by repetition.

Which conditions mimic ALS and get ruled out?

The phrase neurologists use is ALS mimics: diseases that produce weakness, wasting or speech changes resembling motor neuron disease but have a different cause, and often a different outlook. The NINDS and Mayo Clinic both list several, and a good second opinion works through them deliberately.

Condition	Why it can look like ALS	How it is usually distinguished
Multifocal motor neuropathy	Progressive weakness and wasting, often starting in the hands	Nerve conduction studies showing blocked signal; no upper motor neuron signs
Cervical spondylotic myelopathy	Arm wasting plus leg stiffness from spinal cord compression	MRI of the cervical spine; sensory changes often present
Myasthenia gravis	Slurred speech, swallowing trouble, fatigable weakness	Antibody blood tests; repetitive nerve stimulation
Inclusion body myositis	Slow weakness and wasting of forearms and thighs	Muscle biopsy; muscle enzyme levels; EMG pattern
Kennedy’s disease (spinobulbar muscular atrophy)	Bulbar weakness, tongue wasting, twitching	Genetic test; typically no upper motor neuron signs
Thyroid, parathyroid or vitamin disorders	Weakness, twitching, cramps	Routine blood tests
Infections such as HIV or Lyme disease	Can produce motor neuron-like syndromes	Blood tests, spinal fluid analysis

Two patterns deserve special scrutiny. Weakness that stays purely in the lower motor neuron system, without the stiffness and brisk reflexes of upper motor neuron involvement, widens the list of alternatives considerably. And any sensory symptom, such as numbness or tingling, is a flag; ALS classically spares sensation, so its presence prompts a search elsewhere. A reviewer who finds either will often ask for additional tests rather than simply endorsing the original diagnosis.

How is ALS diagnosed, and what tests get repeated or added?

Expect the second-opinion visit to feel like starting over, because in important ways it is. The specialist takes the history themselves rather than relying on notes, examines every limb and the tongue and face, and then decides which investigations to repeat.

EMG is the most frequently redone test. Needle EMG looks for a specific set of changes: ongoing denervation (muscle fibers that have lost their nerve supply) alongside signs of chronic reinnervation (surviving nerves sprouting to take over), ideally in muscles across several body regions. Technique and interpretation vary between laboratories, and the NINDS notes that EMG findings can help confirm ALS or point to another cause. A reviewer may want their own study, performed by their own electrophysiologist, with muscles sampled that the first study did not cover.

Imaging is usually reviewed rather than repeated, unless the original MRI did not include the relevant part of the spine. Blood work is checked for completeness: thyroid function, vitamin B12, creatine kinase, protein studies, and infection screens where indicated. Spinal fluid analysis and muscle biopsy are reserved for cases with atypical features.

Genetic testing deserves its own conversation. Mayo Clinic reports that 5 to 10 percent of ALS cases are inherited, most often through a variant in a gene such as C9orf72 or SOD1. Testing is increasingly offered even without a family history, partly because one gene-targeted therapy now exists for SOD1-related disease and partly because results affect relatives. A second opinion often adds genetic counseling, which the first visit may not have had time for.

Finally, the reviewer applies formal diagnostic criteria. Internationally recognized frameworks grade how definite the diagnosis is based on how many body regions show mixed signs. Hearing where you sit on that scale is itself useful information.

Who usually benefits most from a second opinion, and who may be asked to wait

Almost anyone with a new ALS diagnosis can reasonably seek a second review, and most neuromuscular clinics welcome the referral. Some situations raise the value of that review considerably.

• Diagnosis by a general neurologist without access to a dedicated motor neuron disease clinic.
• Symptoms confined to one region, or to the lower motor neuron system only, when the diagnosis was made.
• Any sensory symptom, bladder change or prominent pain, which are not typical of ALS.
• A younger age at onset, where mimics such as Kennedy’s disease or inflammatory neuropathy are more common.
• A single EMG, performed early, that was the main basis for the call.
• A family history of ALS or frontotemporal dementia, where genetic testing changes the picture.
• Interest in clinical trials, which often require assessment at a research center.

Who might be asked to wait? Not to wait indefinitely, but to pace the process. If the first diagnosis was made at a specialist center with mixed upper and lower motor neuron signs across several regions, supported by EMG and a clean MRI, a reviewer may conclude quickly that the case is clear and redirect effort toward care planning. Some people in that position still value a second confirmation for peace of mind, and that is a legitimate reason.

A different kind of waiting applies to very early presentations. Because ALS declares itself through spread over time, a reviewer who sees only a single weak hand and an equivocal EMG may honestly say that the evidence is not yet sufficient either way, and propose a repeat examination in a defined number of months. That is not evasion; it is the disease’s own timetable. The NHS notes that motor neurone disease is often difficult to diagnose in its early stages for exactly this reason.

How to prepare: the one record every ALS clinic asks you to bring

Ask any neuromuscular nurse what helps most, and the answer is rarely the MRI disc. It is a timeline. Write down, as precisely as you can, when each change began: the month your handwriting shrank, the week a word first came out thick, the stairs that became hard. Note which side, which limb, and in what order. ALS spreads in a recognizably contiguous way, usually from one region to a neighboring one, and a clear chronology lets the reviewer judge whether your story fits that pattern.

Beyond the timeline, gather the following before the visit:

• The full EMG and nerve conduction report, including the raw table of muscles tested, not just the summary line.
• MRI images on disc or through a shared portal, plus the radiologist’s report.
• All blood results, with reference ranges.
• The first neurologist’s clinic letter, which states their reasoning.
• A current medication list and any supplement you take, since some can cause cramps or twitching.
• Family history, including relatives with dementia or unexplained weakness.

Bring someone with you. Two sets of ears retain more, and the person with you can take notes while you concentrate on the examination. Many clinics allow recording the consultation; ask when booking.

Prepare your questions in advance, and put the most important first. Appointments at specialist centers are longer than average, but they still end. If you have been told a particular finding was the deciding factor, say so; the reviewer should address it directly. And be honest about symptoms you may have minimized the first time, such as occasional choking on liquids or shortness of breath lying flat, because these affect both the diagnostic weighing and the urgency of supportive care.

What the days and weeks around a second opinion usually look like

The sequence is fairly predictable, even if the waiting is not.

First comes the referral and records transfer. Most specialist centers want the records before they schedule, so the reviewing neurologist can decide whether to book an EMG on the same day. Waiting times vary by region and are not something this article can promise; your referring team can give a realistic local estimate.

The visit itself often runs longer than a routine neurology appointment because the examination is detailed and the history is retaken. If EMG is repeated, it is usually done the same day or within the following week. Blood tests drawn at the visit return within days. Genetic testing, if sent, typically takes several weeks, and results are delivered with counseling rather than by letter.

Then one of three things happens. The reviewer confirms the diagnosis and, ideally, offers to share ongoing care with the first team. The reviewer finds a different explanation and starts a new pathway. Or the reviewer says the picture is not yet decisive and schedules a repeat assessment, commonly after a defined interval of a few months, to see whether signs have spread.

During these weeks, do not pause supportive care. Physiotherapy, speech and swallowing assessment, and a baseline breathing test can all proceed regardless of the final label, and the NINDS emphasizes that multidisciplinary support improves quality of life. If the first team has already prescribed a disease-modifying medicine, continue it unless the prescriber tells you otherwise; a second opinion is not a reason to stop treatment on your own.

Expect emotional whiplash. Hope rises before the visit and can crash after it. Many clinics have a social worker or psychologist attached precisely for this stretch; it is reasonable to ask for them.

Can ALS progress slowly? What a reviewer reads in the tempo

Yes, and the rate of change is one of the most informative things a second-opinion neurologist assesses. ALS is not one speed. Some people lose function over months; others change so gradually that year-on-year comparison is needed to see it. The NINDS states that most people with ALS die from respiratory failure within 3 to 5 years of first symptoms, but that about 10 percent survive 10 years or more, and that spread shows how wide the range of pace really is.

Why does tempo matter diagnostically? Because very slow progression over many years, especially without upper motor neuron signs, prompts a reviewer to reconsider mimics such as inclusion body myositis, Kennedy’s disease, or a slowly evolving neuropathy. Equally, a disease that has not spread beyond one region after a long interval may represent a restricted variant of motor neuron disease that behaves differently from classic ALS. Neurologists describe these variants with their own names, and the labels carry different expectations.

Several factors are associated with slower courses in population studies, though none predict an individual: younger age at onset, limb rather than bulbar (speech and swallowing) onset, and a longer interval between first symptom and diagnosis, which partly reflects that slow disease takes longer to recognize.

What can you do with this? Keep your timeline updated. Functional rating scales used in clinics score everyday tasks and are repeated at each visit; the slope of those scores over time is more meaningful than any single reading. If your own records show stability across a long stretch, bring them. They are evidence, and a careful reviewer will weigh them.

Is it possible to live with ALS for 20 years? The honest range

A small number of people do, and that fact deserves a precise rather than a hopeful framing.

The figures from the NINDS are the anchor: most people live 3 to 5 years from symptom onset, around 10 percent live 10 years or more, and a smaller group lives considerably longer. Mayo Clinic and the NHS describe the same broad pattern. Survival beyond two decades is documented but uncommon, and the people in that group typically share features such as a slow early course, limb onset, and preserved breathing function for many years.

Two caveats matter. First, these are averages drawn from populations that include every variant and every age. They are not a personal forecast, and no reviewer can give you one with confidence at diagnosis. Second, modern supportive care has lengthened survival for many. Non-invasive ventilation, a mask-based breathing support used mainly at night, and feeding tube placement when swallowing becomes unsafe both extend life and improve comfort, according to NINDS guidance, and the decision to use them is yours to make with your team.

Is ALS always fatal? The condition is currently considered progressive and life-limiting; there is no treatment that halts it. Rare, well-documented cases of improvement exist in the medical literature and are studied intensely, but they are rare enough that a reviewer will not use them to set expectations. What is realistic, and what a second opinion can contribute to, is getting the diagnosis right, starting disease-modifying therapy if appropriate, and building a care plan early enough that each decision is made calmly rather than in crisis.

Can stress make ALS worse? Separating cause, trigger and experience

People ask this question with a specific worry underneath it: did the difficult year before my symptoms cause this, and will the strain of what is coming speed it up?

On cause, the evidence is reassuring. The NINDS lists age, sex, genetics and, less firmly, certain environmental exposures as risk factors. Psychological stress is not an established cause of ALS, and no mainstream body attributes the disease to it.

On progression, the honest answer is that no good evidence shows stress accelerates motor neuron loss. What stress reliably does is make the experience of ALS worse: it disrupts sleep, tightens already-stiff muscles, worsens cramps, blunts appetite and makes breathing feel more labored. Fatigue from poor sleep can look like a decline in strength when the underlying motor function has not changed. A reviewer who sees a sudden functional drop during a period of exhaustion may, sensibly, retest rather than assume disease progression.

So the practical advice is not to pretend calm; it is to treat the effects. Sleep problems, anxiety and low mood are common in ALS and are treatable, and most multidisciplinary clinics include psychological support for this reason. Cleveland Clinic’s overview notes that emotional changes, including a condition called pseudobulbar affect in which laughing or crying occurs out of proportion to feeling, are part of the disease for some people and can be managed.

One more point, because it comes up in support groups: unproven therapies marketed with claims of reversing ALS through stress reduction, detoxification or special diets have not demonstrated benefit in controlled studies. Ask your team before spending money or hope on them.

What a confirmed diagnosis changes about treatment options

If the second opinion confirms ALS, the conversation shifts from whether to how. Several treatment categories exist, and the decision on each sits with your prescribing clinician.

Disease-modifying medicines aim to slow progression rather than reverse it. The NINDS describes three approaches currently in use. One, a glutamate-blocking drug, is thought to reduce the excitotoxic stress that excess glutamate places on motor neurons; in trials it extended survival by a modest number of months. Another is an antioxidant given by infusion or by mouth that targets free-radical damage. The third is a gene-targeted antisense therapy for people with a confirmed SOD1 variant, delivered into the spinal fluid, which is one reason genetic testing has become routine. None of these is a reason to expect dramatic change, and the realistic goal is measured slowing.

Supportive treatment is where most of the gain in quality of life comes from. Physiotherapy maintains range of motion and advises on mobility aids; speech therapy addresses communication and swallowing; dietitians help keep weight stable, since weight loss is associated with faster decline; respiratory therapists monitor breathing and introduce ventilation support when needed. Medicines for cramps, saliva, stiffness and mood are prescribed by symptom.

Clinical trials are a third category. Research centers run them, and eligibility often depends on how long since diagnosis and how well the diagnosis is documented. A second opinion at such a center is frequently the doorway.

The key honesty: all of this is management, not reversal. Johns Hopkins Medicine and the NINDS both describe treatment as aimed at slowing progression, relieving symptoms and preserving independence. That framing is less than anyone wants, and more than was available a generation ago.

What people often get wrong about a second opinion for ALS

Myth: asking for one insults the first neurologist. In neuromuscular medicine it is routine, and many neurologists suggest it themselves. A clinician who objects strongly is the exception.

Myth: a second opinion is only worthwhile if it overturns the diagnosis. Confirmation has value of its own. It allows you to stop searching and start planning, and it often adds genetic counseling, trial access and a multidisciplinary team that the first visit did not include.

Myth: twitching means ALS. Muscle twitching, called fasciculation, is extremely common in healthy people and on its own is not a sign of motor neuron disease. Reviewers look for twitching in weak, wasted muscles with supporting EMG changes, not twitching alone. If twitching without weakness is your only symptom, a neurologist is the right person to see, but the picture is usually benign.

Myth: a normal MRI rules ALS out, or an abnormal EMG rules it in. MRI in ALS is typically normal; its job is to exclude mimics. EMG changes can occur in several other conditions. Neither test stands alone.

Myth: online stories of reversal mean the diagnosis is probably wrong. Documented reversals exist and are studied, but they are rare. The far more common reason a diagnosis changes is that a mimic was identified, which is exactly what a second opinion is designed to catch.

Myth: you should stop treatment until the second opinion is in. Never change a prescribed medicine without the prescriber’s agreement. Supportive care, in particular, should continue throughout.

Myth: a third or fourth opinion will eventually produce a better answer. Two careful specialist reviews that agree are strong evidence. Beyond that, repeated reviews tend to cost time that is better spent on care.

Questions to ask your care team about the ALS second opinion

Write these down and bring them. A good reviewer will welcome them, and the answers will tell you how thorough the process has been.

• Which findings on examination showed upper motor neuron involvement, and which showed lower motor neuron involvement? In how many body regions?
• Where does my case sit on the formal diagnostic criteria you use: definite, probable or possible?
• Which conditions that mimic ALS have been ruled out, and by which test? Is anything still outstanding?
• Did the EMG sample enough muscles across enough regions, or should it be repeated here?
• Do I have any sensory, bladder or pain symptoms that do not fit, and how do you account for them?
• Should I have genetic testing, and what would a result mean for me and for my relatives?
• If the picture is not yet decisive, when would you re-examine me, and what would you be looking for?
• Am I eligible for any clinical trials, and does enrollment have a time window?
• Which disease-modifying therapies would you consider in my situation, and what would you realistically expect them to do?
• Should I have a baseline breathing test and swallowing assessment now?
• How will you share care with my first neurologist, and who do I call between visits?
• Who on your team can help with the emotional side of this, for me and for my family?

One further question is worth asking yourself rather than the doctor: what would I do differently if the diagnosis is confirmed, and what would I do differently if it is not? Knowing your own answer helps you hear theirs.

When to call your doctor

Seeking a second opinion should never delay care for symptoms that need attention now. Whatever stage of the diagnostic process you are in, contact your neurology team promptly, or emergency services if severe, for any of the following.

• Breathing difficulty: shortness of breath at rest, waking breathless, needing extra pillows to sleep, morning headaches, or unusual daytime sleepiness. These can signal weakening breathing muscles and are the most urgent group of warning signs.
• Choking or coughing on food or liquids, or a wet-sounding voice after swallowing, which raise the risk of aspiration and chest infection.
• Fever with cough or increased breathlessness, which may indicate pneumonia.
• Rapid, unexplained weight loss or inability to maintain intake.
• A fall, especially with a head injury or new inability to get up.
• Sudden new symptoms that are not typical of ALS, such as numbness, bladder or bowel change, severe pain or confusion. These need assessment regardless of the ALS label, because they may point to a different and treatable problem.
• Thoughts of self-harm or a mood change that frightens you or those close to you. Support is available and should be asked for early.

Between urgent episodes, keep in touch with the clinic about gradual changes too: new slurring, a weaker grip, more frequent cramps or a drop in your functional score. The NHS advises that people with motor neurone disease have regular reviews with a specialist team, and early reporting lets that team adjust support before a problem becomes a crisis. If you are unsure whether something warrants a call, make the call; nurses in neuromuscular clinics field these questions daily and would rather hear from you.

Frequently asked questions

Is it possible to live with ALS for 20 years?

It is possible but uncommon. According to the NINDS, most people live 3 to 5 years from symptom onset, about 10 percent live 10 years or more, and a smaller group lives considerably longer. Those with very long survival typically have slow early progression, limb rather than bulbar onset, and breathing function preserved for many years. These are population patterns, not individual predictions, and your team cannot forecast your course at diagnosis.

Can ALS progress slowly?

Yes. ALS varies enormously in pace, from rapid decline over months to changes so gradual they are only visible across years. Slow progression is one of the things a second-opinion neurologist weighs carefully, because very slow disease, especially without upper motor neuron signs, raises the possibility of a mimic such as inclusion body myositis or Kennedy’s disease, or a restricted motor neuron variant with a different expected course.

Can stress make ALS worse?

Stress is not an established cause of ALS, and there is no good evidence that it speeds motor neuron loss. What it reliably does is worsen the experience of the disease: poorer sleep, more cramps and stiffness, reduced appetite and a sense of harder breathing. Fatigue can also mimic a functional decline. Treating anxiety, sleep problems and low mood is part of standard multidisciplinary ALS care and is worth asking about.

Is ALS 100% fatal?

ALS is currently considered a progressive, life-limiting disease with no treatment that halts it. Rare, well-documented cases of improvement exist in the medical literature and are studied intensely, but they are uncommon enough that clinicians do not use them to set expectations. Supportive measures such as non-invasive ventilation and feeding support, together with disease-modifying medicines, can extend survival and comfort, with decisions made alongside your treating team.

What is the ALS misdiagnosis rate?

Published series report that a meaningful minority of initial ALS diagnoses are later revised, most often because a mimic such as multifocal motor neuropathy, spinal cord compression or an inflammatory muscle disease is identified; the exact figure varies by setting and study design. The reverse error, delayed recognition of true ALS, also occurs. Both are reasons neuromuscular specialists treat a second review as routine rather than exceptional.

Which conditions mimic ALS most often?

The NINDS and Mayo Clinic list multifocal motor neuropathy, cervical spondylotic myelopathy (spinal cord compression in the neck), myasthenia gravis, inclusion body myositis, Kennedy’s disease, thyroid and vitamin disorders, and infections such as HIV and Lyme disease. Each is distinguished by specific tests, including nerve conduction studies, spinal MRI, antibody blood tests, muscle biopsy or genetic testing, which a second opinion checks have been done.

How is ALS diagnosed if there is no single test?

Through pattern recognition and exclusion. A neurologist looks for the combination of upper motor neuron signs (stiffness, brisk reflexes) and lower motor neuron signs (wasting, twitching, weakness) spreading across body regions over time, supported by EMG findings of active and chronic nerve loss. MRI, blood tests and sometimes spinal fluid analysis rule out other causes. Formal criteria then grade the diagnosis as possible, probable or definite.

Should I see an ALS diagnosis second opinion neurologist who specializes in motor neuron disease?

Ideally, yes. ALS is uncommon, so a general neurologist may see few cases, while a neuromuscular specialist assesses it regularly and often has an attached multidisciplinary clinic, genetic counseling and research trials. Ask your referring doctor for a center with a dedicated motor neuron disease service. The point is expertise with the specific disease, not any particular institution.

Is a second opinion needed if my first symptoms are bulbar, affecting speech and swallowing?

It is often especially useful. Bulbar-onset symptoms, meaning slurred speech, swallowing difficulty or tongue wasting, overlap with myasthenia gravis, Kennedy’s disease and some brainstem conditions, all of which have different treatments. A reviewer will look for upper motor neuron signs in the face and tongue, check antibody tests, and may order genetic testing. Bulbar involvement also makes early swallowing and breathing assessment a priority regardless of the final label.

Will a second opinion delay starting treatment?

It should not, and you should not stop any prescribed medicine on your own while waiting. Disease-modifying therapy already started can continue, and supportive care such as physiotherapy, speech assessment and baseline breathing tests can proceed in parallel. If a reviewer recommends a change, that decision is made with your prescriber. Many specialist centers also offer trial enrollment, which can add options rather than remove them.

References

• Amyotrophic Lateral Sclerosis (ALS), National Institute of Neurological Disorders and Stroke
• Motor neurone disease, NHS
• Amyotrophic Lateral Sclerosis (ALS), Cleveland Clinic
• National ALS Registry, CDC

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.