There is a lacrimal gland above the eyeball, which constantly secretes tears to moisten the surface of the eyeball and keep the cornea bright and clear. Tears secreted by normal people flow to the nasal cavity through the lacrimal passage, so there are generally no tears flowing out.

Suffering from trachoma, chronic conjunctivitis or chronic rhinitis for a long time will involve the mucosa of nasolacrimal duct and cause obstruction of nasolacrimal duct. Tears accumulate in the lacrimal sac and will continue to flow out. When the cold wind blows, the secretion of lacrimal glands will increase, so there will be more tears. Traditional Chinese medicine believes that tears in the wind are mainly caused by yin deficiency of liver and kidney and deficiency of kidney qi, which is stimulated by exogenous cold. Tears are one of the five body fluids. If you shed tears for a long time, your eyes will become blurred, illegible and even blind. Visible, tears in the wind is not a minor illness, should be treated as soon as possible.