Swollen eyes can be caused by a variety of reasons, the more common are allergic factors, infectious factors, physiological factors, etc., in addition to kidney failure, heart failure and other systemic diseases can also be caused. 1. Allergic factors: when allergic patients are exposed to allergens such as pollen and willow flakes floating in the air, allergic reactions will occur, and the patients may have swollen eyelids, which are usually accompanied by itchy symptoms in the eyes. 2. Infectious factors: if the patient does not pay attention to eye hygiene, triggered by pathogens in the eye and infection, such as blepharitis, bacterial conjunctivitis, etc., the patient can appear eyelid redness and swelling, can also be accompanied by eyelid pain and other discomfort. 3. Physiological factors: If the patient sleeps in a prone position, which leads to eyelid compression, causing lymphatic and venous blood reflux obstruction, it can lead to eyelid swelling, which can be relieved after resting. In addition, kidney failure, heart failure and other systemic diseases lead to fluid retention in the patient’s body, which can also cause eyelid swelling. It is recommended that patients with significant eyelid swelling and other discomforts seek medical attention to evaluate their condition and treat them under the guidance of a physician.