A stroke occurs when blood flow to the brain is interrupted, causing brain cells to die. Common symptoms include sudden numbness or weakness, visual changes, severe headaches, confusion, trouble talking, or loss of balance. If someone experiences stroke symptoms, it is crucial to act fast and call 911 right away, as rapid medical intervention can save lives and reduce disability. Preventing strokes involves not smoking, controlling blood pressure, eating a healthy diet, regular health exams, and staying active.