Cold is mainly because the upper respiratory tract is infected with a disease, people in the cold will often show a runny nose, sneezing, nasal congestion and other symptoms, but may also lead to tears, tears after the cold is usually due to the following reasons: 1, after the cold because of inflammation in the respiratory tract, so the turbinates of the nasal cavity will be swollen, this will lead to nasal tract obstruction, and the main tear excretion system on If the nasal passage is blocked, there is no way for tears to drain into the nasal cavity normally, thus causing tears after a cold. 2. If the cold itself is viral, it will affect the conjunctiva of the tears, causing conjunctivitis or keratitis, and when the inflammation is reflexively stimulated, it will lead to a strong secretion of the tear glands, thus causing the symptoms of tears.