Acute ischemic stroke occurs when blood flow to a part of the brain is blocked, usually by a blood clot. This interruption in blood supply can lead to brain cell damage and loss of function in the affected area. Common causes include atherosclerosis, where arteries become narrowed by fatty deposits, and cardiac embolism, where clots form in the heart and travel to the brain. Symptoms of acute ischemic stroke can include sudden weakness, difficulty speaking, and loss of coordination. Prompt medical treatment is crucial to restore blood flow and minimize brain damage. Common treatments involve medications like thrombolytics to dissolve clots or procedures to remove them.