Epilepsy is caused by abnormal discharges of brain cells, and the symptoms and clinical manifestations vary depending on the area of discharge. Main symptoms can include sudden loss of consciousness, rigidity followed by clonic convulsions, and may also involve cyanosis or purpling of the face, tongue biting, frothing at the mouth, urinary incontinence, dilated pupils, continuing for several seconds to minutes before stopping. This condition is called a generalized tonic-clonic seizure. Some patients may also experience sudden brief loss of consciousness and interruption of ongoing actions, with a blank stare and unresponsive to calls. They may perform simple automatic actions like swallowing or chewing. Generally, there is no falling, and the patient has no memory of the episode afterwards. This type of seizure is known as an absence seizure. Additionally, some may experience rigidity and clonic convulsions in one limb or a localized area, etc.