Seizure is usually a sudden and involuntary contraction of a group of muscles. However, a seizure can also be as subtle as marching numbness of a part of body, a brief loss of memory, sparkling of flashes, sniffing an unpleasant odor, a strange epigastric sensation or a sensation of fear. Therefore, it is traditional to classify the seizures as motor, sensory, autonomic[?], emotional[?] and cognitive[?].
Seizure types are:
It is still disputable whether a febrile seizure has to be regarded as an epileptic disorder or not. In general, a patient with two or more episodes of seizures is accepted to have epilepsy (a condition also known as a seizure disorder[?].) Many epileptics have auras before their seizures.
Major causes of seizures are head trauma, infection, tumor and metabolic alterations (e.g. low or high blood glucose levels). Many seizures have unknown causes.