A seizure is an uncontrolled electrical disturbance in the brain caused by an abnormal electrical discharge. Reasons are head injury, stroke, or low blood sugar.
Epilepsy is a neurological disorder that causes recurring seizures. Seizures are sudden, uncontrolled electrical disturbances in the brain.
A brain tumor is a mass or growth of abnormal cells in the brain. Brain tumors can be cancerous or noncancerous, mostly begin in the brain cells or the nerves.