Sudden convulsions for a while may be epileptic seizures, or they may be caused by calcium deficiency or hysteria. 1. Epilepsy: It is a chronic brain disease in which the patient will have convulsions, spasms, fainting and other symptoms. Epilepsy is generally categorized into primary epilepsy and secondary epilepsy. It is recommended that patients go to the hospital in time to find out the cause of the disease and get treated as early as possible to avoid another seizure. 2. Calcium deficiency: If the level of calcium ions in the blood is low, neuromuscular excitability increases, leading to muscle twitching and spasm symptoms. 3. Dysthymia: it can be manifested in a variety of symptoms, may appear suddenly convulsive symptoms, generally have a large mood fluctuations before the onset of the relevant examination is not abnormal. If the symptoms of convulsions, it is recommended that patients go to the hospital in a timely manner, relevant examinations, a clear diagnosis of the cause of the disease, and then targeted treatment, so as not to delay the condition.