The most common causes of coughing when the back is cold are lung qi deficiency, spleen qi deficiency or cough caused by lung spleen qi deficiency, as follows: 1. Lung qi deficiency: in addition to coughing when the back is cold, it is also accompanied by weakness, easy to catch a cold, wheezing, shortness of breath, aggravated by movement, mental fatigue, spontaneous sweating, fear of wind, and a pale tongue with a thin white coating, which is generally treated with ginseng lung pills to tonify the lung and benefit the qi and strengthen the stomach. 2. The cough is accompanied by loss of appetite, chest tightness, loose stools and other symptoms, which can be treated with Lijunzi Pill to tonify the lung and strengthen the spleen, lower the qi and resolve phlegm. 3. Lung and spleen qi deficiency: In addition to coughing when the back is cold, the above symptoms of lung qi deficiency or spleen qi deficiency can be seen, which can also be treated with Lijunzi Pill to tonify the lung and strengthen the spleen, lower the qi and resolve phlegm and stop coughing.