[...]disturbance in its action. Epilepsy is a functional disease. GRAND MAL ( Great Evil ) An unusual feeling called an aura (Latin-vapour), sometimes warns a patient of an impending fit, commonly lasting long eugh to permit him to sit or lie down. This is followed by giddiness, a roaring in the ears, or some unusual sensation, and merciful unconsciousness. In many cases this stage is instantaneous; in others it lasts some seconds-but an eternity to the sufferer. This stage is all that victims can recall (and this only after painful effort) of an attack.[...].