Why your nose runs after eating ground black pepper

 After eating ground black pepper,your nose runs because of gustatory rhinitis,a harmless nerve reflex.When you eat black pepper,natural compounds like piperine stimulate the pain and touch receptors in your nose and mouth.Your body perceives this mild irritation as an attack and produces extra mucus to flush out the irritant.

      This reaction is not a true food allergy,but an overactive nerve response.Black pepper and other hot spices trigger the trigeminal nerve,which controls physical sensations in your face,eyes,and nasal passages.When this nerve is activated,it triggers the mucus glands to drain and the tear ducts to well up,leaving you with a watery nose and eyes.