Long-term colds need to take into account autoimmune deficiency, improper treatment and other reasons. 1. Low immunity: low immunity itself is one of the reasons for the formation and development of colds. For people who suffer from colds themselves, low immunity can also lead to long-term colds, especially for some people with immunodeficiency, which can lead to prolonged colds. 2. Improper treatment: Colds can also be caused by improper treatment. The onset of colds is caused by pathogenic infections, you need to go to the hospital in time to improve the blood tests and other laboratory tests, to determine whether there is a combination or secondary infections, in accordance with the doctor’s instructions standardize the use of antibiotics, or other symptomatic treatment of drugs. The use of antibiotics or other symptomatic medications as prescribed by the doctor will not only fail to cure a cold, but will also cause the cold to linger. Individuals who suffer from colds for a long period of time are advised to consult a doctor in a timely manner to take appropriate medical treatment, and at the same time, do a good job of self-conditioning of the body.