A runny nose at the beginning of a meal may be caused by food irritation, or it may be caused by allergy to food or vasomotor rhinitis. 1. In the process of eating, the heat produced by the food stimulates the mucous membrane of the nasal cavity, then it is easy to increase the nasal secretion and produce the symptom of runny nose. If the food is too spicy, such as hot pot, spicy hot, etc., it is also easy to make the patient’s nasal mucosa stimulation, the phenomenon of snot during meals. 2. If you are allergic to the food you eat, the snotty nose may be a symptom of food-induced allergy, and you should stop eating in time. You can use saline to rinse the nasal cavity appropriately, and you can also take loratadine tablets, cetirizine hydrochloride tablets and other medications. If the symptoms are more serious, you should consult a doctor in time. 3. Vasomotor rhinitis can also cause patients to have a runny nose when they eat, vasomotor rhinitis is a kind of non-allergic, non-infectious inflammation of the nasal mucous membrane, patients with sneezing, runny nose, itchy nose, nasal congestion and other main symptoms, which will be induced when they suffer from some stimuli, such as the inhalation of dry and cold air, temperature changes, irritating odors and so on. The existence of other causes cannot be ruled out. If the symptoms persist, prompt medical examination is recommended.