Common symptoms of epilepsy in children generally include sudden convulsions. During a convulsion, the typical manifestations are tightly closed or staring eyes, rolled-up eyeballs, clenched teeth, twitching at the corners of the mouth, frothing at the mouth, head and neck thrown back, and repetitive flexing or rigid shaking of the limbs. Generally, these can last for a few minutes, or vary from several seconds to ten minutes. Of course, there are also focal seizures, such as twitching of one side of the body, or absence seizures. Some infantile spasms are characterized by jackknife movements, occurring in clusters, with each display being different. The symptoms described earlier are typical of a generalized tonic-clonic seizure.