The common causes of dark circles under the eyes include physiological and pathological factors. 1. Physiological factors: when due to various factors such as staying up late, fatigue, poor diet, mental stress, etc., leading to autonomic nerve disorders, causing poor blood flow in the eyelid blood vessels, venous stasis, which leads to the manifestation of the darkening of the eye circle. 2. Pathological factors: when the patient suffers from blepharitis, blepharitis and other diseases, due to the chronic stimulation of inflammation, resulting in different degrees of pigmentation of the skin around the eyes of the patient, so that the patient will appear in the dark circles of the eyes of the clinical manifestations; when the patient suffers from eyelid phlebitis, due to the varicose veins of the eyelids, blood stasis, leading to the phenomenon of the patient appearing in the dark circles of the eyes. When the darkening of the eye circles occurs, after excluding physiological factors, it is recommended to go to the hospital for further examination and treatment under the guidance of the doctor.