A seizure is a brief and temporary malfunction of normal brain activity. About 1 in 20 people will have a seizure at some stage in their life. To be diagnosed with epilepsy, a person will normally need to have had at least two seizures. Seizures are often compared to a computer crashing.
There are many different types of seizures. It is important to remember that not all types of seizure involve convulsions. The part of brain where the temporary malfunction occurs determines the type seizure a person will have.
In the video below, Epilepsy Specialist Nurse Sinead Murphy explains seizures in more detail.