Stroke occurs when the blood supply to the brain is suddenly interrupted by occlusion, haemorrhage or other causes. Stroke symptoms occur very suddenly and include a numbness or weakness of the face, arms or legs, especially on one side of the body; confusion, trouble speaking or understanding speech; trouble seeing out of one or both eyes; trouble walking, dizziness, loss of balance or coordination; or a severe headache with no known cause. Treatment for stroke includes medications, speech therapy, occupational therapy, physical therapy, lifestyle changes (such as quitting smoking or dietary changes), surgery, and psychological therapies.