Brain tissue dies within minutes when its blood supply stops. A stroke is a sudden interruption of blood flow to part of the brain, either from blockage of an artery (ischemic) or from bleeding (hemorrhagic), causing rapid onset of neurological deficits.

Common signs include facial droop, arm weakness, and speech difficulty. Time-critical treatments for ischemic stroke include thrombolysis and mechanical thrombectomy. Blood-pressure control and reversal of anticoagulation matter in hemorrhage. Immediate imaging distinguishes the two types.

Rehabilitation begins early to maximize recovery of movement, speech, and daily function. Secondary prevention addresses hypertension, atrial fibrillation, lipids, and lifestyle. Public recognition of stroke symptoms and rapid activation of emergency systems save brain tissue and reduce disability.

• Sudden brain injury from interrupted blood flow
• Ischemic or hemorrhagic in origin
• Requires immediate recognition and time-critical treatment
• Followed by rehabilitation and secondary prevention