The causes of upper eyelid swelling are mainly divided into physiological factors and pathological factors. Physiological factors include more subcutaneous fat, dietary stimulation, improper sleep, etc. Pathological factors include inflammatory diseases, non-inflammatory diseases, etc. The main analysis is as follows: I. Physiological factors: 1. More subcutaneous fat: More subcutaneous fat due to genetics or congenital is an important cause of upper eyelid swelling, which does not affect normal life and can be left alone. It can be left untreated; 2. Dietary stimulation: Patients eat pickled food for a long time, such as pickled vegetables and bacon, which contain a large amount of nitrite, which will affect the excretory function of the kidneys and thus lead to ocular edema; drinking a lot of water at night and the accumulation of water in the body will also cause upper eyelid swelling. Usually, by improving diet and lifestyle, the symptoms will gradually ease; 3, improper sleep: is the most common cause of upper eyelid swelling, mainly because the pillow is too low when sleeping affects the blood flow back to the face, resulting in the upper eyelid swelling. Choose the right length and height of the pillow during sleep can help improve the symptoms, such as the length can be maintained in the position of sleep can turn a body. Second, pathological factors: 1, inflammatory diseases: mainly refers to the inflammation of the periocular area, including blepharitis, blepharitis, conjunctivitis, etc. In addition to upper eyelid swelling, patients may also experience itching, pain, foreign body sensation, etc.; it is recommended that patients be treated with local or systemic antibiotics, and if the upper eyelid swelling is more serious and the treatment is not effective, they can cooperate with the doctor to make an incision to drain the pus; 2, non-inflammatory diseases: common ones are Allergic diseases, kidney diseases, heart diseases, thyroid diseases, etc. All these causes can lead to upper eyelid swelling, which usually does not appear as painful and burning symptoms, and patients need to actively treat the primary disease in order to relieve the symptoms of upper eyelid swelling.