Colds, which can also be called upper whistle infections, occur in the fall and winter and are common whistle infections, mostly caused by viruses and, to a lesser extent, bacteria, and can usually heal on their own. Part of the population often cold, may be due to chronic rhinitis, allergic rhinitis, immune deficiency caused by. 1.Cold caused by chronic rhinitis. It is a chronic inflammation of the nasal mucosa, mainly manifested as increased nasal secretions, nasal congestion, congestion and edema of the nasal mucosa, etc., and more delayed, while recurrent, long duration, and there is no clear pathogen, the intervals of the disease are manifested; 2, colds caused by allergic rhinitis. It is induced by environmental and genetic interactions, exists at any age, is a non-infectious inflammatory response of the mucosa of the nasal cavity, related to the body, mainly manifested as clear snot, sneezing, nasal itching, nasal congestion, etc., the symptoms last for a long time; 3, colds caused by immune deficiency. People with low immunity are susceptible to invasion of various pathogenic microorganisms into the organism, leading to the occurrence of diseases, and such people often catch colds, manifested as runny nose, nasal congestion and other symptoms. People with frequent colds should identify whether they are caused by chronic rhinitis and allergic rhinitis, followed by attention to their own immunity, and need to seek timely medical attention and help from specialist doctors to get rid of frequent colds and recover early.