Tears in the eyes all the time are usually considered to be related to conjunctivitis, dry eye, dacryocystitis and other diseases. 1. Conjunctivitis: it may be due to conjunctivitis, inflammation stimulation leads to congestion of the conjunctiva of the face to appear foreign body sensation, causing the phenomenon of eyes keep running tears, conjunctivitis may also appear foreign body sensation, burning sensation and other symptoms. 2. Dry eye: it may be due to frequent overuse of the eyes, abnormal posture, frequent use of electronic products, resulting in visual fatigue, causing insufficient secretion of the lacrimal glands, resulting in dryness of the eyes, the phenomenon of the eyes have been running tears, dry eye may also appear tired, itchy eyes, foreign body sensation and other symptoms. 3. Dacryocystitis: it may be due to inflammatory lesions of the dacryocystitis, leading to blockage of the tear ducts caused by the phenomenon of constant tearing of the eyes, dacryocystitis may also appear red, swollen, fever and other symptoms. There are other reasons why the eyes keep watering, please consult the hospital in time to avoid delaying the condition.