Tears in the eyes when going out in the morning may be caused by foreign body residue, conjunctivitis and facial paralysis. 1. Foreign body residue: It may be caused by the presence of foreign body residue in the cornea of the eye, especially if the patient has recently been exposed to a more impure environment, the foreign body in the air often enters the eye and stays in the cornea, resulting in watery eyes. 2. Conjunctivitis: It can also be caused by conjunctivitis, which can cause conjunctival congestion and edema, and if it encounters strong light stimulation, it will cause the phenomenon of watering eyes. 3. Facial paralysis: Some patients may have facial paralysis due to the stimulation of cold and other reasons, which may also cause the phenomenon of watery eyes. Therefore, if the patient has serious symptoms of watering eyes or accompanied by other uncomfortable symptoms, he should go to the hospital in time, to clarify the cause of the disease, so as to target the treatment.