If a large amount of tears is stimulated by temperature, it is normal, but if a large amount of tears is a pathological manifestation, the main reasons are the following: 1, excessive tear secretion caused by conjunctiva, cornea, iris, ciliary body and other tissue lesions or foreign bodies, ultraviolet light and chemicals and other factors stimulation. For example: severe viral and bacterial conjunctivitis; keratitis or corneal ulcer; corneal epithelial abrasion, corneal epithelial detachment, corneal foreign body, conjunctival sac foreign body, etc.; 2. Due to the obstruction of the lacrimal system, the normally secreted tears cannot drain smoothly into the nasal cavity through the nasolacrimal duct, but instead reflux and overflow. For example: tear point obstruction, tear duct obstruction, nasolacrimal duct obstruction, chronic dacryocystitis, etc. 3. Due to eyelid deformity and lower lid ectropion, the tear dots located on the lower lid cannot be placed close to the eyeball and tears cannot enter the tear dots and tears cannot enter the nasal cavity through the tear ducts, thus overflowing. 4. Difficulties in eyelid closure, such as facial nerve palsy that causes relaxation of the orbicularis oculi muscle, epileptic shrinkage or weak expansion of the tear sac, resulting in insufficient suction of the tear sac, can also lead to tears not entering the tear duct normally and thus overflowing. Therefore, there are various eye diseases that can cause “tears in the wind”.