Swelling in the face and eyes of patients may be caused by staying up late, drinking too much water, allergy, renal insufficiency and other reasons. 1. Physiological factors: If patients drink a lot of water or stay up late at night before going to bed, swelling of the face and eyes will appear in the morning, which is usually not accompanied by other discomforts, does not need special treatment, and can be gradually relieved after rest. 2. Allergy: When allergic patients come into contact with allergens through skin contact, ingestion, inhalation, etc., it will lead to an allergic reaction in the body, and the patients will have swollen face and eyes, which may be accompanied by itchy face and eyes and other uncomfortable symptoms. 3. Renal insufficiency: patients with renal insufficiency cannot excrete a large amount of metabolic wastes and water through the kidneys, which results in water stagnation in the body, leading to swelling in the face and eyes, and may be accompanied by edema of the lower limbs. It is recommended that patients with severe swelling of the face and eyelids should consult a doctor in time to assess their condition and take treatment under the guidance of the doctor.