Grand mal seizures, also called tonic-clonic seizures, account for about 50% of seizures, mostly around the age of 1 year or between the ages of 14 and 17. It can be divided into four phases: aura phase, tonic phase, clonic phase, and recovery phase. 1, aura phase: about 15% of patients with grand mal seizures have aura, common symptoms are epigastric discomfort, dizziness, emotional instability, etc.; special symptoms include feeling scared, smelling strange odors, hearing strange sounds, etc. These symptoms mostly appear within a few seconds or tens of seconds before the seizure. 2. Tonic phase: sudden loss of consciousness, falling to the ground, generalized muscle tonicity, torso in forward flexion, head tilted back, stiff unflexed neck, flexion tonicity of both upper extremities, extension tonicity of both lower extremities, dilated pupils, respiratory arrest, generalized bruising; due to compartment muscle spasm, the patient emits “lamb”-like roar, lasting about 10 seconds. 3, clonic phase: rhythmic muscle twitching throughout the body, often bite through the tongue (chewing muscle twitching), spitting blood, may be accompanied by incontinence, pupillary reflexes and various deep and shallow reflexes are gone, lasting 1-3 minutes. 4.Recovery period: As the whole body muscles gradually relax, the frequency of twitching will slowly decrease until it stops completely. The patient’s whole body is relaxed, breathing is slowly smoothed out to normal, face color also returns to normal, drowsiness turns into slumber, and consciousness returns to normal. After waking up, there is no memory of the seizure, which lasts for more than 10 minutes to several hours. During a grand mal seizure, due to the long struggle, too much physical energy is consumed, and after the seizure, the patient often feels extremely tired and also has headache, dizziness, and generalized muscle aches and pains. During a grand mal seizure, the patient needs careful care. Patients with prolonged seizures and more severe seizures are at risk of turning into continuous seizures if they are not treated in time.