Seizures are temporary episodes of abnormal electrical activity in the brain. This abnormal electrical activity can lead to signs and symptoms that range from mild to severe, including an abnormal sensation or smell, brief staring, uncontrollable jerking of the limbs and periods of unconsciousness. Seizures most often indicate the presence of a brain disorder called epilepsy , but they can also occur without epilepsy in conditions such as high fever, severe sleep loss, medications, drug or alcohol withdrawal and abnormal sodium or glucose levels in the blood. If you or a loved one receives