EEG slow wave increase is a pathology that is a more serious condition. Trauma, brain tumors, epilepsy, as well as infections, carbon monoxide poisoning, increased cerebral pressure, pulmonary encephalopathy, and encephalitis can all present with a limited increase in EEG slow waves. In the case of widespread slow wave increase, which is associated with widespread cortical damage, such as inflammation, coma, and diffuse lesions, a full-lead slow wave increase may be present. Whether the EEG slow wave increase is serious needs to be analyzed with the patient’s clinical symptoms. It is recommended that the patient go to the neurology department of the hospital in time to determine the specific cause of the disease, and then actively treat the disease under the guidance of the doctor, do not self-medication to avoid adverse reactions.