According to the National Institute of Health's MedlinePlus, a seizure is the change in behavior that happens after the brain experiences a period of abnormal electrical activity. The Epilepsy Foundation describes two types of seizures: primary generalized seizures and partial seizures.
A primary generalized seizure involves both sides of the brain, while a partial seizure involves only one part of the brain. MedlinePlus states that seizures usually last less than 15 minutes and symptoms includes loss of consciousness, loss of bladder control, drooling, muscle spasms and teeth clenching. Anyone who experiences these symptoms and has never had a seizure before should call a doctor immediately and go to the emergency room.