Tears are necessary for the normal lubrication of the eye and to wash away particles and foreign bodies. Excessive tear production or improper drainage of the tear duct results in watery eyes. Irritation, infection, and inward-growing eyelashes can also cause watery eyes. An infection or blockage of the tear duct can also cause excessive watering of the eyes when tears do not drain normally through the nose.
Increased tearing is sometimes accompanied by yawning, vomiting, laughing, and eyestrain.
Oddly enough, one of the most common causes of tear is dry eyes. Drying causes the eyes to become uncomfortable which stimulates the body to produce too many tears. One of the main evaluations for tearing, is to check if the eyes are too dry!
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