Delayed-onset dyskinesia and epilepsy can be differentiated by clinical symptoms and diagnostic basis. 1. Clinical symptoms: delayed-onset dyskinesia may result in involuntary movements of the mouth, lips, tongue, face, limbs and trunk; epilepsy is characterized by seizures, transient, repetitive and stereotyped, which may manifest as sensory, motor, consciousness, psychiatric, behavioral, autonomic dysfunction or both. 2. Diagnostic basis: delayed dyskinesia usually has a history of antipsychotic medication for more than 3 months and moderate dyskinesia in at least 1 part of the body or mild abnormal movements in 2 parts of the body; epileptic patients will have epileptiform discharges in the EEG, which is then combined with the patient’s symptoms of repetitive muscular twitching and cranial imaging to make the diagnosis. It is recommended to go to a professional medical institution and conduct relevant examinations under the guidance of a physician to identify the condition.