Normal human nasal mucosa has a small amount of fluid to moisturize, protection, when the nasal cavity is attacked by pathogenic sources, these pathogenic bacteria will stimulate the local nasal mucosa, the human body out of its own protective role, the nasal mucosa local capillaries will be expanded, congestion, edema, oozing, secretion of a large number of tissues in order to kill invasive bacteria, which is usually seen in the "nasal mucus". When the exudate has a lot of white blood cells, the snot is white and thick, when there are a lot of red blood cells, the snot is yellow, and if the exudate is dominated by lymphocytes, the snot is more abundant and clear and watery.

Treatment of nasal congestion with "1% fumar liquid nasal drops" or "nemetazoline hydrochloride nasal drops" nasal drops; adult dose of oral "Baiyanjin" and "sodium bicarbonate" tablets 2 tablets, finagan tablets 12.5 mg, 2 times a day, "amoxicillin" tablets 0.5 grams, 3 times a day, after meals for 5 days. Drink plenty of water during the medication.