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CT scan of the patient's brain and the hand of a doctor.

How to Spot a Stroke and Stroke Prevention

A stroke occurs when part of the brain is deprived of blood. The cells in the affected area will then begin to die due to a lack of oxygen. As the brain cells die, the abilities controlled by that part of the brain are lost. A person may experience partial paralysis, loss of speech, memory loss or weakness in one part of the body.