A stroke is a sudden, life-threatening episode that occurs when the blood supply to part of the brain is suddenly interrupted or when a blood vessel in the brain bursts. Also known as a cerebrovascular accident (or CVA), a stroke can affect movement, sensory perception, and consciousness. Symptoms of a stroke most often appear suddenly; multiple symptoms will often occur at the same time. Examples of stroke symptoms can include trouble walking, dizziness, confusion, difficulty seeing, and numbness or weakness in the limbs or face. A stroke is a medical emergency; if you or someone else experiences stroke-like symptoms, get help right away.