The causes of ocular edema in patients who wake up in the morning usually include physiological factors as well as pathologic factors such as ocular diseases, renal diseases and ocular allergies. If the patient does not sleep enough or the quality of sleep is poor, it can lead to watery eyes. If patients drink too much water before going to bed or cry for a long time, it can cause water retention in the patient’s body, which can cause eye edema. Patients with kidney diseases such as nephrotic syndrome and glomerulonephritis may have water retention in the body due to kidney dysfunction, which may cause edema of the patient’s eyelids. If local inflammation of the eyes occurs, such as blepharitis, conjunctivitis, etc., patients may experience redness, swelling, heat, pain and other uncomfortable symptoms, which may also lead to edema of the patient’s eyes. Allergic factors such as mosquito bites or contact dermatitis may also lead to oedema. It is recommended that patients with significant eye edema should seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.