Epilepsy is a chronic recurrent disease, and the diagnosis is considered in the following three main aspects. 1. Clinical manifestations Most important! Epilepsy is a clinical diagnosis, mainly based on clinical manifestations, most of which manifest as convulsive seizures, but also a variety of seizure forms, such as disorientation, laughter, aphasia, etc. Parents must pay attention to the situation during each convulsive seizure, such as: seizure time, aura before the seizure, head, eyes and limbs performance during the seizure, incontinence, bruising, loss of consciousness, duration, post-seizure condition, etc. If the seizure is accompanied by any disease, such as fever, encephalitis, or hypocalcemia, it is usually not diagnosed as epilepsy first. A single convulsive seizure is also generally not diagnosed as epilepsy in the first place. If the parents did not witness the seizure, ask the person who saw it for details. If possible, record the seizure process for the doctor’s analysis and judgment. 2. EEG Very important, but not the deciding factor! EEG can record the brain electrical activity, which will show abnormality in epilepsy. It can clarify the type of epilepsy and determine the site, but it should be noted that: (1) EEG abnormality is not equal to epilepsy EEG is a very complex graphic, and children are even more variable with age. Normal children’s EEG can also have abnormalities, even with epileptic waves. (2) A normal EEG cannot exclude epilepsy. Seizures are intermittent and the EEG is not abnormal all the time. When the seizure focus is small and deep, it may not be recorded on the surface of the brain. The primary epilepsy has no visible lesions, while the secondary epilepsy often has visible lesions, such as nodular sclerosis, hemangioma, abnormal brain development, etc. Try to do an MRI to clarify whether there are lesions. CT examination is not as clear as MRI, and there is a potential risk of radiation.