Seizures

Seizures are caused by a sudden surge of electrical activity in the brain. A seizure usually affects how a person looks or acts for a short time. Someone having a seizure might collapse, shake uncontrollably, or even just stare into space. All of these are brief disturbances in brain function, often with a loss of or change in consciousness.

Usually, electrical activity in the brain involves neurons in different areas sending signals at different times. During a seizure, many neurons fire all at once. This abnormal electrical activity can cause different symptoms depending on the part of the brain involved, including unusual sensations, uncontrollable muscle spasms, and loss of consciousness.

People with epilepsy have repeated seizures.