I. Generalized seizures: The initial clinical signs of seizures indicate bilateral hemispheric involvement at the beginning of the seizure, often accompanied by impaired consciousness. Motor symptoms are bilateral. The EEG during seizure is initially a bilateral hemispheric generalized discharge.1. generalized tonic-clonic seizure (GTCS): Loss of consciousness, bilateral tonicity followed by clonic sequences of activity are the main clinical features of generalized tonic-clonic seizures. It may evolve from partial seizures or may be manifested as generalized tonic-clonic seizures at the onset of the disease. Early on, loss of consciousness and fall occur. Subsequent seizures are divided into three phases: 1 tonic phase: manifested as a continuous contraction of the whole body bones and iliac muscles: eye muscle contraction appears eyelid upward, eye upturn or gaze; masticatory muscle contraction appears mouth strong opening, followed by violent closure, can bite the tip of the tongue; tonic contraction of the laryngeal and respiratory muscles causes the patient to scream; tonic contraction of the neck and trunk muscles causes the neck and trunk to first flex, then recoil: the upper limbs are rotated from upward to inward forward rotation The lower limbs are first flexed and then violently straightened, lasting 10-20 seconds before entering the clonic phase; 2 clonic phase: the patient changes from tonic to clonic, with a short interval after each clonic, the clonic frequency gradually becomes slower, the interval lengthens, and after a violent clonic, the seizure stops and enters the late seizure phase. The above two phases are accompanied by respiratory arrest, elevated blood pressure, pupil dilation, and increased saliva and other percussion; 3 Late seizure: there are still brief clonus in this phase, which can cause dental closure and urinary and fecal incontinence. Respiration is first restored, followed by gradual normalization of pupils, blood pressure, and heart rate. Myotonia relaxes and consciousness gradually returns. It takes about 5~15 minutes from the onset to the recovery of consciousness. After waking up, patients often feel headache, body aches, drowsiness, and some patients have blurred consciousness. 2. Absence seizure: It is divided into typical and atypical absence. Typical absence is characterized by suspension of movement, staring, and no response to call, without or with slight motor symptoms. It usually lasts 5-20 seconds, but rarely lasts more than 1 minute. The EEG is a regular, bilaterally synchronized 3-Hz spike-and-slow-wave complex during seizures. It is mainly seen in children and adolescents with aphasic epilepsy. Atypical anhedonia is characterized by a slow onset and end of consciousness, which may be accompanied by mild motor symptoms, and the EEG may show a slow spike-and-slow wave complex rhythm during seizures. This is mainly seen in Lennox-Gastaut syndrome, but also in other childhood epilepsy syndromes. 3. tonic seizure: This is an intense and continuous contraction of the whole body or bilateral muscles, with muscle rigidity and dorsiflexion or forward flexion of the torso. It usually lasts for several seconds to tens of seconds, but usually does not exceed one minute. The EEG shows bilateral bursts of low-amplitude fast activity or high-amplitude spike rhythms during the seizure. Tonic seizures are mainly seen in Lennox-Gastaut syndrome. 4. clonic seizure: intermittent contraction of the active muscles called clonic, resulting in rhythmic jerking of the limbs. The EEG during the seizure period is fast-wave activity or spike-slow/multi-spike slow-wave integrated rhythm. 5, myoclonic seizure (myoclonic seizure): manifested as rapid, brief, electroshock-like muscle contraction, can be throughout the body, but also can be limited to a muscle group, often occurring in clusters. The typical EEG during seizure is a comprehensive multi-spine slow-wave synthesis that appears explosively. Myoclonus includes both physiological and pathological myoclonus, but not all myoclonus is a seizure. Only myoclonus with concomitant EEG epileptiform discharges is a seizure. Myoclonic seizures can be seen in some patients with idiopathic epilepsy with a good prognosis (e.g., benign myoclonic epilepsy in infants, myoclonic epilepsy in adolescents) and in some epilepsy syndromes with a poor prognosis and diffuse brain damage (e.g., early myoclonic encephalopathy, severe myoclonic epilepsy in infants, Lennox-Gastaut syndrome, etc.).6. Spasm (spasm): manifests as Sudden, transient tonic flexion or extension contraction of the trunk muscles and bilateral limbs, mostly manifested as episodic head nodding and occasionally episodic backward tilting. The entire course of its muscle contraction is about 1 to 3 seconds, often in clusters of episodes. It is common in infantile spasms, and other infantile syndromes can sometimes be seen. 7. atonic seizure: is due to the sudden loss of muscle tone in bilateral parts or the whole body, resulting in the inability to maintain the original posture, appearing to fall, falling limbs and other manifestations, the seizure time is relatively short, lasting from a few seconds to more than 10 seconds is common, the seizure duration is short without obvious impaired consciousness. EEG manifests as a full-blown burst of multi-spike slow-wave rhythms, low-amplitude electrical activity, or electrical suppression. Atonic seizures can be seen in epileptic encephalopathies such as Lennox-Gastaut syndrome and Doose syndrome (myoclonic-standing inability epilepsy). However, there are certain patients who have only atonic seizures, the etiology of which is unknown.