Focal epilepsy, also called partial epilepsy, is a seizure disorder in which seizure

Seizure

An epileptic seizure, occasionally referred to as a fit, is defined as a transient symptom of "abnormal excessive or synchronous neuronal activity in the brain". The outward effect can be as dramatic as a wild thrashing movement or as mild as a brief loss of awareness...

s are preceded by an isolated disturbance of a cerebral function. Such disturbances may include a twitching of a part of the body, such as a limb; a deceptive or illusory sensation or feeling, or some other mental disturbance. It is a subtype of epilepsy

Epilepsy

Epilepsy is a common chronic neurological disorder characterized by seizures. These seizures are transient signs and/or symptoms of abnormal, excessive or hypersynchronous neuronal activity in the brain.About 50 million people worldwide have epilepsy, and nearly two out of every three new cases...

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The cause of the isolated disturbances results from the electrical signals that cause the seizure emanating from a specific part of the brain.

International Classification of Partial Seizures

1. Simple (with no interruption to consciousness)

2. Complex (interrupts consciousness)

3. Partial seizures evolving to a secondary generalized seizures