Yawning with tears and runny nose may be a normal physiological reaction, or it may be caused by sinus disease, allergies and other reasons. 1. Normal physiological reaction: There are lacrimal glands present in the human eye, and when the lacrimal glands show tears, the tears enter the nasal cavity through the lacrimal tubules and the tear ducts. When yawning, the action of yawning will lead to increased pressure in the nasal cavity, resulting in nasolacrimal duct blockage, manifested as tear reflux, which is a normal physiological reaction. 2. Sinus disease: there are several sinuses behind the nasal cavity, all have the function of secretion, but also store a certain amount of liquid, in yawning when the facial muscles are in a state of stimulation and tension, if the sinuses after the disease has a crack, there will be the phenomenon of sinus liquid overflow, the phenomenon of runny nose, because of the nasal cavity and the lacrimal glands are the same, so it may also be accompanied by the phenomenon of running tears. 3. Allergy: Patients with allergic conjunctivitis can have itchy eyes and watery eyes if they are exposed to allergic substances. If there is an allergic reaction in the nasal cavity, sneezing and runny nose can occur, and tearing can also occur. Patients who experience yawning and tearing and runny nose, accompanied by other uncomfortable symptoms, should go to the hospital in time to avoid delaying the condition and causing adverse consequences.