Subdural Hematoma: The Bleed That Can Hide for Weeks, Especially After 60
Last updated September 4, 2026.
A subdural hematoma is bleeding into the space between the brain and its outer covering, where the collecting blood presses on the brain itself. It comes in two tempos. The acute form follows major head trauma and declares itself within hours: it is an emergency from the start. The chronic form is the trap: in an older adult, especially one on blood thinners, a bump so minor it is forgotten can start a slow ooze that produces symptoms days to weeks later: headache, confusion, unsteadiness, drowsiness, personality change, weakness on one side. The chronic form is one of the most fixable serious brain problems in medicine, which is exactly why the delayed symptoms must never be waved away as age.
Why age and blood thinners change the math
With age the brain shrinks slightly, stretching the small bridging veins that cross the space where these bleeds occur, so a minor jolt, a low fall, a bumped head on a cabinet, even vigorous coughing, can tear one. Anticoagulants and antiplatelet medicines, apixaban, warfarin, aspirin, clopidogrel, then let the small tear keep oozing. The classic story is a trivial or unremembered knock, weeks of being slightly off, and a family member who finally names it: he is just not himself. Alcohol use and repeated falls add risk. Younger people get subdurals too, but from forces nobody mistakes for minor.
A head bump weeks ago plus creeping headache, confusion, or unsteadiness in an older adult, especially on blood thinners, is a same-day scan. The chronic subdural is common, sneaky, and remarkably fixable.
Start a free AI doctor consult →The symptoms, early and late
The chronic bleed announces itself in a pattern families often catch first: a headache that creeps in and persists, new confusion or slowed thinking, balance that is newly unreliable, drowsiness beyond the ordinary, and changes in personality or behavior. Weakness or numbness down one side, slurred speech, worsening drowsiness, vomiting, or a seizure move it to the emergency column. After any head injury in someone on blood thinners, the rule is simple: get checked even when the bump seems trivial, and any delayed symptom in the following weeks earns a same-day call, because the scan that finds the bleed takes minutes.
Treatment and the outlook that surprises people
Small, quiet hematomas are watched with repeat scans as the body reabsorbs them. Symptomatic ones are drained, usually through a small burr hole under anesthesia, one of the oldest and most effective operations in neurosurgery, and the recovery after drainage of a chronic hematoma is often striking: confusion lifting within days, balance returning, families getting the person back. Blood thinners are paused and restarted on a schedule the team sets. Recurrence happens in a minority and is watched for on follow-up scans. Falls prevention afterward is treatment, not housekeeping: it is how the second bleed gets prevented.
- Weeks of creeping headache, confusion, or unsteadiness after any head bump in an older adult is a scan, not a shrug. The triviality of the knock is exactly the trap; on blood thinners the bar is lower still.
- "He is just not himself" is a symptom. Families catch chronic subdurals before doctors do. Say it out loud at the appointment, with the timeline attached.
- Drainage is common, brief, and often dramatic. The chronic subdural is one of the most reversible causes of confusion and unsteadiness in older adults, and the recovery frequently surprises the family.
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Common questions
What is a subdural hematoma?
Bleeding into the space between the brain and its outer covering, where the collecting blood presses on the brain. The acute form follows major trauma within hours; the chronic form, mostly in older adults, oozes slowly after a minor bump and produces symptoms days to weeks later.
Who is at risk for the chronic form?
Older adults, because the brain shrinks slightly with age and stretches the veins that tear; anyone on anticoagulants or antiplatelet medicines; and people with frequent falls or heavy alcohol use. The triggering bump is often so minor it is forgotten.
What are the symptoms of a chronic subdural hematoma?
A creeping persistent headache, new confusion or slowed thinking, unsteady balance, unusual drowsiness, and personality or behavior change, developing over days to weeks. One-sided weakness, slurred speech, worsening drowsiness, vomiting, or seizure are emergency signs.
Should I get checked after a minor head bump on blood thinners?
Yes: even a trivial-seeming bump in someone on anticoagulants warrants medical review, and any delayed symptom in the following weeks, headache, confusion, unsteadiness, earns a same-day call. The scan that answers it takes minutes.
How is a subdural hematoma treated?
Small quiet ones are watched with repeat scans as the body reabsorbs them. Symptomatic ones are drained through a small burr hole, one of the oldest and most effective operations in neurosurgery. Blood thinners are paused and restarted on a schedule the team sets, and recurrence is watched for on follow-up scans.
What is the recovery like?
After drainage of a chronic hematoma, recovery is often striking: confusion lifting within days, balance returning. Rehabilitation fills any remaining gaps, falls prevention becomes part of the treatment, and most older adults return to their prior lives, which is why the delayed symptoms should never be accepted as age.