Someone is said to have epilepsy if they experience two or more unprovoked seizures separated by at least 24 hours. In epilepsy, the normal pattern of neuronal activity becomes disturbed, causing strange sensations, emotions, and behaviour or sometimes convulsions, muscle spasms, and loss of consciousness. The epilepsies have many possible causes and there are several types of seizures. Anything that disturbs the normal pattern of neuron activity-from illness to brain damage to abnormal brain development-can lead to seizures.
Epilepsy may develop because of an abnormality in brain wiring, an imbalance of nerve signalling chemicals called neurotransmitters, changes in important features of brain cells called channels, or some combination of these and other factors. Many times, a doctor may not able to pin point the exact cause of epilepsy.