Epileptic seizures result from abnormal electrical activity in the brain. About 50 million people worldwide have epilepsy. Onset of new cases occurs most frequently in infants and the elderly. About 3% of people will be diagnosed with epilepsy at some time in their lives.
Congenital and developmental conditions are mostly associated with it among younger patients; tumors are more likely over age 40; head trauma and central nervous system infections may occur at any age. Up to 5% of people experience seizures at some point in life.