Sudden convulsions in the elderly should be considered from secondary epilepsy, intracranial infection, diabetes and other causes, as follows: First, secondary epilepsy: ask the patient if there is any previous cerebrovascular disease, such as cerebral infarction, cerebral hemorrhage, especially with lobe infarction and lobe hemorrhage. If there is a sudden convulsion of the limbs, accompanied by impaired consciousness and urinary incontinence, it is necessary to consider that the patient may have a secondary epileptic condition. Second, intracranial infection: the sudden convulsions of the elderly, ask the patient whether there is a fever, whether there is a recent cold, whether there is a history of diarrhea, the need to go to the hospital to do a plain and enhanced examination of the cranial magnetic resonance to understand whether there is intracranial infection. Third, diabetes: ask the patient whether there is diabetes in the past, some diabetic patients are prone to convulsions when their blood sugar is too high or too low, this time need to perform blood sugar testing.