Seizures are brief episodes of abnormal electrical activity in the brain that cause changes in movement, behavior, or consciousness. Around 2 million people in the US have epilepsy, with 300,000 under age 18 and 100,000 new cases reported each year. Common types of seizures include generalized tonic-clonic, absence, myoclonic, atonic, and simple or complex partial seizures. First aid for seizures involves cushioning the head, loosening tight clothing, turning the person on their side after the seizure ends, and calling for emergency help if it lasts over 5 minutes.