seizure

seizure Uncontrolled electrical activity in the brain that may produce a physical convulsion, minor physical signs, thought disturbances, or a combination of symptoms. The type of symptoms and seizures experienced depend on where the abnormal electrical activity takes place in the brain, what its root cause is, and such factors as the patient’s age and general state of health. Seizures can be caused by head injuries, brain tumors, lead poisoning, maldevelopment of the brain, genetic and infectious illnesses, and fevers. In half of patients with seizures, no cause can yet be found. See also epilepsy; seizure disorder.