Drinking water at night and having swollen eyes the next day may be caused by physiological factors, and may also be caused by abnormalities of the kidneys, cardiac function, blepharitis, etc. The patient can be treated by local cold compresses on the eyes or medication, etc., to promote the subsiding of the eyes. Under normal circumstances, drinking water at night the next day is not swollen eyes. If you drink a lot of water at night, the next day there may be swelling of the eyes, the patient can do local cold compresses on the eyes to promote the swelling of the eyes to subside. Patients with swollen eyes may also be caused by abnormalities in renal and cardiac function, as the body retains water and fluid, resulting in swollen eyes. Patients can follow the doctor’s instructions to use furosemide and other drugs to promote eye swelling subside, the condition of recovery. If the patient’s eye swelling is obvious and accompanied by pain, redness, itching and other uncomfortable symptoms, may be blepharitis and other eye inflammation caused by the patient can follow the doctor’s instructions to use levofloxacin eye drops, erythromycin ophthalmic ointment and other medications to control inflammation, promote eye swelling subside. It is recommended that patients whose eye swelling subsides consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.