Stroke

Stroke occurs when blood flow to part of the brain is disrupted, usually by a blood clot.

Summary

Stroke occurs when blood flow to part of the brain is disrupted, usually by a blood clot. Stroke symptoms may include dizziness, confusion, weakness on one side, co-ordination problems. A bleeding stroke usually causes a sudden, severe headache. Any stroke-like signs should be considered a medical emergency

What is stroke?

Stroke occurs when blood flow to part of the brain is disrupted, cutting off the oxygen supply. After minutes without oxygen, brain cells are permanently damaged, and die if the blood supply is not restored. Ischaemic strokes result when an artery becomes blocked, usually by a blood clot. Haemorrhagic (bleeding) strokes are caused by bleeding from ruptured arteries in the brain.

What are the symptoms and signs of stroke

A bleeding stroke is usually sudden, and may be heralded by a severe headache, sometimes with a stiff neck, and unconsciousness. Ischaemic strokes are usually more gradual, developing over minutes, hours or days. They may be preceded by a "mini-stroke", or transient Ischaemic attack (TIA), which occurs when a blood clot causes temporary stroke-like loss of function.

Stroke symptoms and signs may also include:

Paralysis, weakness, numbness or tingling, usually on one side of the body
Facial droop
Drooling
Vision problems
Difficulty walking
Clumsiness and loss of balance
Dizziness
Difficulty speaking or comprehending
Confusion and personality changes
Nausea or vomiting
Seizure

Get help immediately if:

A person shows signs of stroke. Medication that breaks down blood clots, if given as soon as possible after the stroke, can limit permanent brain damage in some cases.
You suspect someone has had a TIA i.e. there are stroke-like signs, however temporary or seemingly slight. These also require immediate medical attention.