An seizure happens when there is sudden electrical activity in the brain. Epilepsy is the cause of the seizure, yes; Epilepsy is diagnosed when a person has 2 or more seizures. A person with an seizure would be unconsious, shaking, unresponsive [Well please note that not every seizure involves shaking], but some of others' seizures may be less noticable by: shaking more less, and staring into space like nothing. Tips when you see someone with an seizure: -Don't do a CPR -Don't put things in the person's mouth -Call an ambulance -Move the person especially in dangerous situations(such as in the middle of the road, as that person can get hit by a car)