Vocal Cord Paralysis

What is vocal cord paralysis?

Vocal cord paralysis is a condition in which one or both of the vocal cords (also called vocal folds) cannot move the way they should. The vocal cords are two small bands of muscle and soft tissue inside the larynx, or voice box, which sits at the top of the windpipe in the neck. When you speak, the vocal cords come together and vibrate to make sound. When you breathe, they open apart to let air pass. When you swallow, they close to help keep food and liquid out of the airway. If the nerve signals that control these movements are interrupted, one or both cords can become weak or completely still. Doctors classify this condition under the code ICD-10 J38.00 when it is not specified as one-sided or two-sided.

Understanding what is vocal cord paralysis begins with the nerves involved. The vocal cords are controlled mainly by the recurrent laryngeal nerves, which branch off the vagus nerve and follow a long, winding path through the neck and upper chest. Because of this long route, the nerves can be injured or affected by problems anywhere along the way — not only in the throat itself.

Vocal cord paralysis can affect people of any age, including newborns, although it is more often diagnosed in adults. It may involve one vocal cord (unilateral paralysis), which mainly affects the voice and swallowing, or both cords (bilateral paralysis), which can be more serious because it may narrow the airway and make breathing difficult. A milder form, in which the cord moves but weakly, is sometimes called vocal cord paresis.

Symptoms of vocal cord paralysis

Vocal cord paralysis symptoms depend on whether one or both cords are affected, how the paralyzed cord is positioned, and whether swallowing is involved. Some people notice a sudden voice change after surgery or an illness; in others, symptoms develop gradually and are mistaken for a lingering cold or ordinary hoarseness.

Common symptoms include:

• Hoarseness — a rough, raspy, or strained voice quality
• Breathy voice — the voice sounds weak or airy because air escapes between the cords
• Reduced voice volume — difficulty being heard, especially in noisy places
• Voice fatigue — the voice tires quickly with normal talking
• Loss of vocal pitch range — trouble singing or raising the voice
• Frequent throat clearing or a sensation of something in the throat
• Choking or coughing when swallowing food, drinks, or saliva
• Shortness of breath during speech or exertion
• Noisy breathing (a high-pitched sound called stridor), especially when both cords are affected

With unilateral paralysis (one cord), the voice is usually the main problem. The healthy cord cannot fully close the gap left by the paralyzed one, so the voice sounds breathy and weak, and swallowing may feel unsafe because the airway does not seal completely. Some people run out of air quickly while speaking because air leaks through the gap.

With bilateral paralysis (both cords), the situation is often reversed. If both cords rest close to the middle, the voice may sound nearly normal, but the airway opening becomes narrow, causing noisy breathing, shortness of breath, and, in severe cases, a breathing emergency. If both cords rest apart, breathing may be easier but the voice is very weak and swallowing problems can be significant.

Over time, symptoms may change. In many cases the healthy vocal cord gradually compensates by moving farther across to meet the paralyzed one, so the voice can improve even if the nerve does not recover. In other cases, ongoing aspiration — food or liquid entering the airway — can lead to repeated chest infections, which is an important warning sign.

Causes and risk factors

Vocal cord paralysis causes fall into several broad groups, all related to damage or pressure on the nerves that control the larynx, or occasionally to problems in the brain or the vocal cord joint itself. In a notable share of cases, no cause is found despite thorough testing; doctors call this idiopathic vocal cord paralysis.

• Surgical injury. Operations in the neck or chest — such as thyroid or parathyroid surgery, cervical spine surgery, carotid artery surgery, and some heart, lung, or esophageal procedures — can stretch, bruise, or cut the recurrent laryngeal nerve. This is one of the most frequently identified causes.
• Tumors. Growths in the neck, thyroid gland, lungs, esophagus, or at the base of the skull can press on or invade the nerve. Both benign (noncancerous) and malignant (cancerous) tumors can be responsible, which is why doctors often order imaging to look along the entire nerve pathway.
• Viral infections and inflammation. Some viral illnesses are thought to inflame the nerve and temporarily or permanently impair it. Many idiopathic cases are believed to follow a viral infection.
• Neck or chest trauma. Blunt or penetrating injuries can damage the nerve directly.
• Breathing tube injury. Prolonged intubation (a breathing tube placed through the voice box, for example during intensive care) can injure the vocal cords or the small joints that move them, or put pressure on nerve branches.
• Neurological conditions. Stroke, Parkinson’s disease, multiple sclerosis, and other disorders of the brain and nerves can impair vocal cord movement, because the signals begin in the brainstem.
• Other medical conditions. Enlargement of the heart or major blood vessels in the chest, certain autoimmune and inflammatory diseases, and some infections can affect the nerve along its course.

Risk factors follow from these causes: a history of neck or chest surgery, known tumors in the neck or chest, recent prolonged intubation, and certain neurological diseases all raise the likelihood. In newborns, vocal cord paralysis can be present at birth, sometimes related to birth trauma or nervous system conditions, and it is a recognized cause of noisy breathing and feeding difficulty in infants.

Diagnosis

Vocal cord paralysis diagnosis starts with a careful history and a direct look at the vocal cords. Doctors want to answer two questions: are the cords actually paralyzed, and if so, why?

Steps your doctor may take include:

• Medical history and voice assessment. The doctor asks when the voice changed, whether it followed surgery, illness, or injury, and whether you have trouble swallowing or breathing. Listening to the voice itself provides important clues.
• Flexible laryngoscopy. This is the key test. A thin, flexible tube with a camera (a laryngoscope) is passed through the nose to view the vocal cords while you breathe and speak. It allows the doctor to see directly whether one or both cords are not moving. The examination is usually done in the clinic with local numbing spray and takes only a few minutes.
• Videostroboscopy. A specialized examination using a strobe light that makes the rapid vibration of the vocal cords appear in slow motion. It helps assess how well the cords close and vibrate, which guides treatment decisions.
• Laryngeal electromyography (EMG). Small needle electrodes measure the electrical activity of the voice box muscles. This test can help distinguish true nerve paralysis from a mechanically fixed joint, and in some cases it offers clues about the chance of nerve recovery. It is not available or necessary everywhere.
• Imaging. Because the nerve travels from the skull base through the neck into the chest, doctors often order a CT (computed tomography) scan or MRI (magnetic resonance imaging) covering this entire pathway to look for tumors, enlarged lymph nodes, or other structural causes — especially when there is no obvious explanation such as recent surgery.
• Swallowing evaluation. If choking or coughing with meals is a concern, a swallowing study may be performed to check whether food or liquid is entering the airway.
• Blood tests. In selected cases, tests may look for infections, inflammatory conditions, or other underlying diseases.

Distinguishing paralysis from other causes of an immobile vocal cord matters, because the treatments differ. For example, scarring or dislocation of the small joint that moves the cord (the cricoarytenoid joint) can mimic nerve paralysis but is a mechanical problem rather than a nerve problem.

Treatment options

Vocal cord paralysis treatment depends on the cause, whether one or both cords are affected, how severe the symptoms are, and how much time has passed since the paralysis began. Care is usually led by an ear, nose, and throat specialist, often working with a speech-language pathologist (a therapist trained in voice and swallowing). At Acibadem, this condition is managed within the Otorhinolaryngology (ENT) department.

Watchful waiting

Nerves can recover slowly, and in many cases vocal cord function improves on its own over months — recovery within the first six to twelve months is possible, particularly when the nerve was stretched or inflamed rather than cut. For this reason, doctors often recommend a period of observation before permanent surgery, especially when the cause suggests the nerve may heal. During this time, temporary measures can keep the voice usable and swallowing safe.

Voice therapy

Voice therapy with a speech-language pathologist is frequently the first treatment. Exercises aim to strengthen the working cord, improve breath support, encourage the healthy cord to compensate, and teach safer swallowing techniques. Voice therapy does not repair the nerve, but it can meaningfully improve voice quality and function, and it is often used alongside procedures as well.

Treating the underlying cause

If the paralysis is caused by a tumor, infection, or another treatable condition, addressing that problem is a priority and may influence which voice treatments are appropriate.

Injection augmentation

For unilateral paralysis, a common procedure is vocal cord injection: a filler material (such as a gel-like substance or the patient’s own fat) is injected into the paralyzed cord to plump it up and move it toward the middle. This helps the healthy cord meet it, improving voice and swallowing. Many injectable materials are temporary, lasting weeks to months, which makes injection a useful option while waiting to see whether the nerve recovers. The procedure can often be done in the clinic under local anesthesia or in the operating room.

Medialization laryngoplasty (thyroplasty)

If paralysis persists and symptoms remain troublesome, a surgeon may place a small, permanent implant through the neck to push the paralyzed cord toward the middle. This operation, called medialization laryngoplasty or thyroplasty, is typically performed with the patient awake enough to speak during the procedure so the surgeon can fine-tune the voice result. It can be combined with repositioning of the cartilage at the back of the cord (arytenoid adduction) when needed.

Nerve procedures

In selected patients, a nerve reinnervation procedure connects a nearby healthy nerve to the voice box muscles. This does not restore movement, but it can maintain the muscle tone and bulk of the paralyzed cord, which may improve the voice over time. Results develop gradually over months.

Treatment for bilateral paralysis

When both cords are paralyzed and breathing is compromised, the goals shift toward protecting the airway. Options may include procedures that widen the airway by removing or repositioning part of a vocal cord or the cartilage behind it, or, in urgent situations, a tracheostomy — a surgical opening in the windpipe below the voice box that allows breathing to bypass the narrowed area. Widening the airway can make the voice weaker, so doctors and patients weigh breathing, voice, and swallowing priorities together. In some cases a tracheostomy is temporary while awaiting nerve recovery or further surgery.

There is no medication that directly restores vocal cord movement, although drugs may be used to treat an underlying cause such as inflammation or infection. Your doctor may recommend a combination of approaches, and treatment plans are often adjusted as recovery — or the lack of it — becomes clearer over time.

Living with vocal cord paralysis and outlook

The outlook varies widely. Some people recover vocal cord movement fully within months, particularly when the nerve was irritated rather than severed. Others regain a good voice without nerve recovery because the healthy cord compensates or because a procedure closes the gap. And some people live with a permanently paralyzed cord managed with surgery and therapy. No doctor can guarantee a specific outcome, but most people with unilateral paralysis can achieve a serviceable, and often near-normal, voice with appropriate treatment.

Day to day, several practical steps can help:

• Stay well hydrated; dry vocal cords work harder.
• Avoid straining, shouting, or whispering forcefully, which can fatigue the voice.
• Follow any swallowing precautions your care team recommends, such as eating slowly, taking small bites, or thickening liquids if advised.
• Attend voice therapy sessions consistently; the exercises build on each other.
• Avoid smoking and limit exposure to irritants, which inflame the larynx.
• Report new breathing difficulty, worsening choking, or repeated chest infections to your doctor promptly.

Emotional effects are real and worth acknowledging. The voice is closely tied to identity, work, and social life, and losing it — even temporarily — can be distressing. Support from family, employers, and, when needed, a counselor can make the adjustment easier. For people whose work depends on the voice, such as teachers or singers, early involvement of a voice specialist is especially helpful.

Frequently asked questions

What is vocal cord paralysis in simple terms?

It means one or both of the vocal cords in the voice box cannot move normally because the nerve signals controlling them are interrupted. Since the cords are needed for speaking, breathing, and safe swallowing, paralysis can cause a weak or hoarse voice, choking with liquids, or, when both cords are affected, breathing problems.

Can vocal cord paralysis heal on its own?

In many cases, yes — especially when the nerve was stretched, inflamed, or bruised rather than cut. Recovery, when it happens, usually occurs within the first six to twelve months. Because of this, doctors often recommend observation, voice therapy, or a temporary injection before considering permanent surgery. If the cord has not recovered after about a year, spontaneous improvement becomes less likely, though the voice can still often be improved with treatment.

How serious is vocal cord paralysis?

It depends on the type. Paralysis of one cord mainly affects the voice and swallowing and is rarely life-threatening, although aspiration of food or liquid can lead to pneumonia if untreated. Paralysis of both cords can narrow the airway and cause dangerous breathing difficulty, which may require urgent treatment. The underlying cause also matters, since paralysis can occasionally be the first sign of a tumor or neurological condition, which is why a thorough evaluation is important.

What are the most common vocal cord paralysis symptoms?

The most common symptoms are a hoarse, breathy, or weak voice, voice fatigue, running out of air while speaking, and coughing or choking when swallowing, especially with thin liquids. When both cords are paralyzed, noisy breathing and shortness of breath may be the main problems. Symptoms vary from person to person and can change over time as the body compensates.

What causes vocal cord paralysis after thyroid surgery?

The recurrent laryngeal nerve, which moves the vocal cord, runs directly behind the thyroid gland. During thyroid or parathyroid surgery the nerve can be stretched, bruised, or, rarely, cut. Temporary weakness after surgery often recovers over weeks to months. If hoarseness persists, an ear, nose, and throat specialist can examine the cords and discuss options, from voice therapy to injections or surgery.

How is vocal cord paralysis diagnosed?

Diagnosis is confirmed by looking directly at the vocal cords with a flexible camera passed through the nose (laryngoscopy), which shows whether one or both cords are not moving. Doctors may add videostroboscopy to assess vibration, laryngeal EMG to test the nerve and muscle, and CT or MRI scans of the neck and chest to search for a cause along the nerve’s pathway. A swallowing study may be done if choking is a concern.

How long does recovery take after vocal cord paralysis treatment?

It varies with the treatment. Temporary injections often improve the voice quickly, though the effect wears off over weeks to months. After implant surgery (thyroplasty), the voice typically settles over several weeks as swelling resolves. Nerve reinnervation procedures work gradually, with improvement developing over many months. Voice therapy also produces gradual gains with regular practice. Your care team can give you expectations based on your specific situation, but timelines differ from person to person.

When to see a doctor

See a doctor if hoarseness or a voice change lasts more than two to three weeks without an obvious cause such as a cold, if your voice changed after surgery on the neck or chest, or if you regularly cough or choke when eating or drinking. Persistent voice changes should always be examined, because they can signal conditions that need treatment.

Seek emergency care immediately if you or someone else has any of the following:

• Severe difficulty breathing or a feeling of the airway closing
• Noisy, high-pitched breathing (stridor), especially if it is new or worsening
• Bluish color of the lips or face
• Inability to swallow saliva, or drooling with distress
• Choking episodes that do not clear, or repeated choking with fever and cough, which may suggest aspiration pneumonia
• Sudden complete loss of voice together with breathing difficulty

Bilateral vocal cord paralysis in particular can cause rapid breathing problems and should always be treated as urgent. For non-emergency concerns, an otorhinolaryngology (ear, nose, and throat) specialist is the appropriate doctor to evaluate voice changes and confirm or rule out vocal cord paralysis.