The possible clinical causes of tearing are allergy to cosmetic ingredients, irritating substances in cosmetics, and inadvertent entry of cosmetics into the eyes, etc. This condition is mostly seen in people with sensitive bodies. 1. Allergy to cosmetic ingredients: this situation is mostly seen in sensitive people, cosmetic ingredients are more complex, some of the ingredients are allergens, which may cause some people to have an allergic reaction, clinical manifestations of persistent secretion of tears, itching of the skin of the eyes, redness and swelling of the eyes and so on. 2. Irritants in cosmetics: The ingredients of poor quality cosmetics do not meet the national requirements for cosmetic ingredients or do not meet the national standards for cosmetics, which contain some irritating ingredients that can irritate the mucous membranes of the eyes and the skin, thus causing users to experience persistent tearing, redness and swelling of the eyes, eye pain and other symptoms. 3. Cosmetics inadvertently into the eye: corneal tissue is more sensitive, for the external stimulation of foreign objects will have a more violent reaction, if in the process of make-up cosmetics accidentally into the eye, the cornea as well as other tissues will cause irritation, resulting in watering eyes, eye pain or infection and so on. If the symptoms of tearing persist, then it is still necessary to go to the hospital ophthalmology consultation, through the examination to clarify whether the cosmetics are the causative factors, so as to carry out targeted treatment.