80-year-old old man convulsions have the following reasons: first, can be due to brain seizures caused by convulsions, generally patients are due to brain diseases, such as intracranial occupation or large cerebral infarction, cerebral hemorrhage, resulting in abnormal synchronization of neuronal discharge in the brain, the patient can be manifested as the upper limb flexion, lower limb straightening, generally after the electroencephalogram and the head of the imaging examination can be confirmed. Second, the 80-year-old man appeared convulsions, clinically can also be seen in the cardiogenic disease As seizures, because the patient is older, considering the existence of coronary atherosclerosis. Due to the coronary artery stenosis or occlusion, the patient can have a seizure, manifested as convulsions, accompanied by loss of consciousness, if necessary, the patient should be given resuscitation and other treatments. Third, the 80-year-old old man appeared convulsions, if the patient due to poor food, can also be due to water electrolyte disorders caused by convulsions, if necessary, to carry out serum ion and blood gas analysis and other tests.