Colds, also known as upper respiratory tract infections, occurring in the fall and winter, are common respiratory infections, mostly caused by viruses and, to a lesser extent, bacteria, which can usually be self-cured. Some people often catch colds, which may be caused by chronic rhinitis, allergic rhinitis and low immunity. 1.Cold caused by chronic rhinitis. It is a chronic inflammation of the nasal mucosa, mainly characterized by increased nasal secretions, nasal congestion, thickening and swelling of the nasal mucosa, etc. It is often prolonged, recurrent and long-lasting, and there is no clear pathogen. 2, allergic rhinitis caused by cold. It is induced by environmental and genetic interactions, and exists at any age. It is a non-infectious inflammatory reaction of the nasal mucosa, which is related to the physique, and is mainly manifested as clear snot, sneezing, itchy nose, nasal congestion, etc., and the symptoms last for a long time; 3. Colds caused by low immunity. People with low immunity are susceptible to various pathogenic microorganisms invading the organism, leading to the occurrence of diseases, and such people often catch colds, manifested by symptoms such as runny nose and nasal congestion. People who often catch a cold should identify whether it is caused by chronic rhinitis and allergic rhinitis, and then pay attention to their own immunity, need to consult a doctor in a timely manner, seek the help of specialists, get rid of the plague of frequent colds, and get well soon.