The first reason is that spicy food contains a substance called capsaicin, which, once eaten by the patient, stimulates the peripheral nerves on the patient’s tongue and mouth, and is then transmitted to the brain center. The center of the brain then gives an order, the patient will appear heartbeat accelerated, the whole body saliva and sweat gland secretion increased, will also appear nasal secretions increased and other related performance, manifested as increased nasal mucus. The second reason is that once the patient eats spicy food, the spicy food is volatile and easily stimulates the sensory nerve endings at the junction of the nasal cavity and the oral cavity, and after the sensory nerve endings are excited, the mucous membrane of the nasal cavity will be congested, resulting in local vasodilation and increased permeability of the blood vessels, resulting in a large amount of nasal mucus and other related manifestations. For eating spicy runny nose, this is a normal human physiological reaction, the best way for patients who have a particularly large amount of runny nose is to try not to eat spicy, try to avoid.