Chronic Subdural Hematoma

Chronic Subdural Hematoma is a slow collection of blood between the brain surface and its outer covering, usually developing over days to weeks after a minor head injury. It is most common in older adults and is treatable, especially when recognized and assessed by a neurology or neurosurgery specialist.

Overview

Chronic Subdural Hematoma is a collection of old or slowly accumulating blood between the brain and the dura, the tough outer membrane that surrounds the brain. The word “chronic” means that it develops gradually, often over several weeks, rather than immediately after an injury. Because the bleeding is usually slow, symptoms may appear later and may be mistaken for aging, dementia, stroke, or general weakness.

This condition often follows a minor head injury, such as a bump, fall, or sudden jolt, especially in older adults. In some people, the injury is so mild that they do not remember it. As the blood collection enlarges, it can press on the brain and interfere with normal brain function.

Chronic subdural hematoma is a neurosurgical condition, but it is also commonly evaluated by neurologists, emergency physicians, geriatricians, and rehabilitation specialists. Many people improve significantly with timely diagnosis and appropriate treatment. The safest approach depends on the size of the hematoma, the person’s symptoms, medications, age, and general health.

Symptoms

Chronic subdural hematoma symptoms can develop slowly and may fluctuate from day to day. A person may initially feel only mild headache or tiredness, then gradually develop changes in walking, thinking, speech, or strength. Symptoms can be more noticeable to family members than to the affected person.

Common symptoms may include:

• Persistent or worsening headache
• Confusion, memory problems, or reduced concentration
• Drowsiness, unusual sleepiness, or reduced alertness
• Unsteady walking, falls, dizziness, or loss of balance
• Weakness or numbness on one side of the body
• Speech difficulty, slowed responses, or personality changes
• Nausea, vomiting, or seizures in some cases

In older adults, chronic subdural hematoma can resemble dementia, depression, Parkinson-like slowness, or stroke. Any new change in mental state, walking ability, or limb strength after a fall should be taken seriously, even if the fall seemed minor. Early medical assessment helps distinguish this treatable condition from other neurological disorders.

Causes & Risk Factors

Chronic subdural hematoma usually begins when small veins bridging the space between the brain and dura tear after head movement or trauma. In older adults, the brain naturally loses some volume with age, which can stretch these veins and make them more vulnerable to tearing. The initial bleed may be small, but inflammation and repeated minor bleeding can cause the collection to enlarge over time.

Risk factors include older age, a history of falls, previous head injury, blood-thinning or antiplatelet medication, bleeding disorders, heavy alcohol use, and conditions that increase fall risk. People with brain shrinkage from age, long-term alcohol exposure, or previous neurological disease may be more susceptible. Chronic subdural hematoma can also occur after neurosurgery, although this is less common.

Not every head injury causes a hematoma, and not every hematoma becomes dangerous. However, risk is higher when a person develops new neurological symptoms after trauma, especially if they take medication that affects clotting. A doctor should review the full medical history and medication list before decisions are made about monitoring or treatment.

Diagnosis

Diagnosis starts with a careful clinical assessment. The doctor asks about head injury, falls, medication use, headache pattern, changes in memory or behavior, weakness, balance problems, and other neurological symptoms. A neurological examination checks alertness, speech, eye movements, strength, sensation, reflexes, coordination, and walking when safe.

Brain imaging is essential to confirm chronic subdural hematoma. A CT scan is often the first test because it is widely available and can quickly show a blood collection, pressure on the brain, and whether the brain’s midline is shifted. MRI may be used when more detail is needed, when symptoms are unexplained, or when the age and structure of the hematoma need closer evaluation.

Blood tests may be performed to check clotting function, blood count, kidney and liver function, and the effects of blood-thinning medication. In some cases, doctors also assess fall risk, heart rhythm, blood pressure, or other conditions that may have contributed to the injury. The diagnosis is made by combining symptoms, examination findings, imaging results, and overall medical context.

Treatment Options

Treatment for chronic subdural hematoma is individualized. The right approach is decided by a specialist after assessment of the person’s symptoms, imaging findings, hematoma size, pressure on the brain, age, medication use, and medical risks. The goal is to relieve pressure on the brain, prevent worsening, and support recovery as safely as possible.

Small hematomas with mild or no symptoms may be monitored with repeat examinations and follow-up imaging. Doctors may also review medicines that affect bleeding or clotting, but patients should not stop prescribed blood-thinning medication unless a qualified doctor advises it. Supportive care may include fall prevention, hydration, treatment of other medical problems, and rehabilitation when weakness or balance issues are present.

When symptoms are significant or imaging shows pressure on the brain, surgical drainage may be recommended. Common neurosurgical approaches include drainage through small openings in the skull or, less commonly, a larger operation if the hematoma is complex, recurrent, or organized. In selected cases, specialists may consider newer minimally invasive vascular procedures to reduce recurrence risk, depending on local expertise and patient suitability.

Some patients need rehabilitation after treatment, especially if they had weakness, walking difficulty, or confusion. Follow-up appointments are important because chronic subdural hematoma can recur, particularly in people with risk factors. A neurosurgeon or neurologist will advise on monitoring, activity, medication management, and when repeat imaging is needed.

Living With / Prognosis

Many people recover well from chronic subdural hematoma, particularly when it is recognized before severe pressure on the brain develops. Recovery may be quick for some patients, while others need time for headache, fatigue, balance, or thinking problems to improve. Older adults or people with other neurological conditions may require a longer rehabilitation period.

Living safely after diagnosis or treatment often focuses on preventing falls and recognizing recurrent symptoms early. Practical steps may include reviewing home hazards, using appropriate walking aids, checking vision and hearing, managing dizziness, and discussing medication risks with a doctor. Family members and caregivers can help by watching for changes in alertness, speech, walking, mood, or strength.

Prognosis depends on several factors, including the size of the hematoma, the degree of brain compression, speed of diagnosis, other medical conditions, and whether the hematoma returns. Regular follow-up allows doctors to confirm that the blood collection is resolving and that the person is regaining function. International patients can access multidisciplinary evaluation and treatment for chronic subdural hematoma at Acibadem International’s JCI-accredited hospitals, where neurology, neurosurgery, imaging, intensive care, and rehabilitation teams work together when needed.

When to See a Doctor

A doctor should assess any persistent headache, confusion, balance problem, weakness, speech change, unusual sleepiness, or personality change after a head injury. This is especially important for older adults, people who have fallen, and anyone taking medication that affects blood clotting. Even a minor bump to the head can be relevant if symptoms appear days or weeks later.

Urgent medical care is needed if a person has sudden weakness on one side, severe or worsening headache, repeated vomiting, seizure, fainting, marked drowsiness, new confusion, difficulty speaking, or reduced consciousness. These symptoms may indicate pressure on the brain or another serious neurological problem that requires immediate evaluation.

People already diagnosed with chronic subdural hematoma should follow their specialist’s advice about repeat imaging and activity. They should seek prompt medical review if previous symptoms return or worsen after observation or treatment. This information is educational and should not replace assessment by a qualified healthcare professional.

Frequently asked questions

What is chronic subdural hematoma?

Chronic subdural hematoma is a slow collection of blood between the surface of the brain and the dura, the brain’s outer protective covering. It usually develops over days to weeks, often after a minor head injury. The blood collection can press on the brain and cause headache, confusion, weakness, or walking problems.

Is chronic subdural hematoma the same as a stroke?

No. A stroke is usually caused by blocked or bleeding blood vessels within the brain, while chronic subdural hematoma is a blood collection around the brain. However, the symptoms can look similar, such as weakness, speech difficulty, or confusion. Brain imaging is needed to tell the difference.

Can chronic subdural hematoma happen without a clear injury?

Yes. Some people do not remember a head injury because the original trauma may have been very mild. This is especially common in older adults, whose brain changes can make small bridging veins more vulnerable. Medication that affects clotting can also increase the chance of bleeding after minor trauma.

How is chronic subdural hematoma diagnosed?

Doctors diagnose it using a neurological examination and brain imaging. A CT scan is commonly used first because it can quickly show the blood collection and any pressure on the brain. MRI may be used for more detailed assessment in selected cases.

Does every chronic subdural hematoma need surgery?

No. Small hematomas with mild or no symptoms may be monitored carefully with follow-up visits and imaging. Surgery or another procedure may be recommended if symptoms are significant or the scan shows pressure on the brain. The decision is made by a specialist after reviewing the individual situation.

Can chronic subdural hematoma come back after treatment?

Yes, recurrence can happen, especially in people with risk factors such as older age, blood-thinning medication, or repeated falls. Follow-up imaging and medical review help detect recurrence early. Patients should report any return of headache, confusion, weakness, sleepiness, or walking difficulty.

What should families watch for after a fall in an older adult?

Families should watch for new headache, drowsiness, confusion, memory changes, unsteady walking, falls, weakness, speech problems, or personality changes. These symptoms may appear days or weeks after a seemingly minor head injury. A medical assessment is recommended if any of these changes occur.

References

• American Association of Neurological Surgeons
• National Institute of Neurological Disorders and Stroke
• Mayo Clinic
• NHS
• European Association of Neurosurgical Societies

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.