Tears can be caused by environmental stimulation, mental stimulation, nerve stimulation, eye lesions and other factors, if accompanied by other discomforts, it is recommended to consult a doctor in time. 1. Environmental stimuli: such as long-term exposure to cold, heat, wind, smoke, dust, bright light and other stimuli, you can trigger the flow of tears, generally stop the above stimuli, the symptoms can be significantly relieved. 2. Mental stimulation: such as emotional excitement, high mental tension, etc., can induce an increase in tear secretion, thus triggering the phenomenon of easy tears. 3. Nerve stimulation: including visual stimulation, trigeminal nerve stimulation, facial nerve stimulation, and taste reflex tearing. 4. Ocular lesions: such as dacryocystitis, keratitis, blepharitis and other ocular inflammatory stimuli, as well as tear duct ectropion, inverted eyelashes, lacrimal tract tumors, etc. can trigger the body to tear, the patient can also be accompanied by eye congestion, swelling, blurred vision and other uncomfortable symptoms. Patients are usually prone to tearing, avoiding external stimuli after the symptoms are not relieved, or accompanied by other discomforts, should consult a doctor in a timely manner, under the guidance of the doctor to identify the cause of the disease, if necessary, follow the doctor’s instructions for appropriate treatment.