The most common factor of runny nose while eating is allergic rhinitis, such as eating spicy and irritating or volatile food, and when eating food in bad gas, runny nose can occur due to the irritating food and the irritating gas around. In the early stage of wind-cold type cold, runny nose may also appear when eating something, but it is accompanied by cough, dry throat, dizziness, headache, and usually blue-colored nasal discharge with thin nasal discharge. Runny nose accompanied by irritating symptoms such as watery eyes when eating hot food occurs because the nasal mucosa is too thin or the nasal septum is deviated, and the runny nose occurs after smelling irritating food, overheated food and overheated hot steam.