Swollen face and swollen eyes for no reason may be caused by drinking too much water before going to bed, or consider chronic glomerulonephritis, hypothyroidism and other diseases. 1. Drinking too much water before going to bed: When drinking too much water before going to bed, it will lead to water can not be discharged from the body in a timely manner, water and sodium retention occurs, manifested as a swollen face and swollen eyes for no reason. If there is no other discomfort, it is a normal phenomenon, no need to worry. 2. Chronic glomerulonephritis: The causes of chronic glomerulonephritis are related to heredity, infection, low immunity, metabolic disorders and other factors. Patients may have symptoms of edema, such as swelling of eyelids and face after waking up in the morning, and swelling of both lower limbs in the afternoon. 3. Hypothyroidism: Hypothyroidism is mainly caused by autoimmune diseases, destruction of the thyroid gland, drugs and other factors. Patients may have symptoms such as facial and eyelid edema, joint pain, and fatigue. There are many reasons that cause patients to have swollen face and eyes for no reason, and it is recommended that they go to the regular hospital in time to find out the cause of the disease.