Sudden convulsions are mainly considered for the following reasons: 1, primary seizures: due to abnormal brain discharges, patients often have a history of epilepsy, there will be a sudden onset of grand mal seizures, manifested as impaired consciousness, twitching of the limbs, crooked mouth, foaming at the mouth, and even incontinence. Epilepsy is divided into primary and secondary. Primary epilepsy is convulsions without other causes, and patients need long-term oral antiepileptic drugs; 2. Secondary epilepsy: epilepsy caused by other diseases, common causes include intracranial tumors, cerebrovascular diseases such as cerebral infarction, cerebral hemorrhage, and intracranial infections; 3. Endocrine diseases: sudden convulsions can occur in diabetic patients with hypoglycemia when their blood sugar is poorly controlled. Hyperthyroidism patients can also have sudden convulsions, while patients with electrolyte disorders leading to hand and foot convulsions are common in adolescents, often due to hypocalcemia causing convulsions; 4, trauma causing tetanus bacillus infection, patients will have a clear history of trauma; 5, hyperthermia convulsions can cause convulsions, traumatic brain injury, central nervous system infection can cause central convulsions.