Under normal circumstances, the secretion and excretion of tears are in balance. If the eyes are constantly tearing, there may be an abnormality and a hospital should be visited for examination to clarify the cause and determine the treatment plan. Patients must develop good eye habits in general, do not look at mobile phones or computers for long periods of time, avoid rubbing the eyes with dirty hands, insist on eye exercises and eye care, and go out with good protection.