The causes of swollen eyes in the morning usually include physiological causes and pathological causes such as abnormal kidney function and allergic reactions, etc., which require prompt medical treatment. 1. Drinking too much water before going to bed at night, staying up too late, and over-exerting your eyes can cause watery eyes the next morning, but it is generally a normal phenomenon and will disappear soon after rest. 2. Swollen eyes every morning may also be due to abnormal kidney function caused by the symptoms, if the eyelid edema continues to not subside need to go to the hospital in time for kidney function tests to rule out abnormal kidney function caused by fluid retention in the body. 3. When allergy susceptible to contact with dust, pollen and other substances may also cause severe eye edema, such conditions, if any, need to immediately away from the allergens, and go to the hospital for examination in order to clarify the diagnosis. If your eyes are swollen in the morning and you do not see any relief after improving your bad habits or if they are accompanied by other discomforts, it is recommended that you consult a doctor for timely treatment.