Stroke occurs when the blood supply to the brain is restricted or stopped, causing brain cells to die. It is diagnosed through neurological exams, CT scans, MRI scans, Doppler ultrasound, or arteriography. Treatment depends on the type and severity of stroke, and may include medicines to prevent blood clots, reduce blood pressure, or repair damage from bleeding in the brain. Stroke recovery can be a long process and may involve rehabilitation to help the patient regain independence and adjust emotionally and socially.