Normally, your body's nerve cells communicate with each other via carefully controlled electric signals. If something interferes with those signals and they become more intense, a seizure results. While seizures are usually brief, their effects may linger for several hours. There are different types of seizures. The type you experience depends on which area of the brain has the abnormal electrical signals.
Most seizures occur randomly, at any time and without any particular cause.
However, you might have some advance notice. Those warning signals are called auras. An aura may precede a seizure by a few seconds or even minutes. Use that time to safeguard yourself. For example, if you are chewing, remove the food from your mouth.