Cold back can be caused by environmental factors, external wind-cold, and Yang deficiency in the body. 1. Environmental factors: If you are in a low-temperature environment for a long time, such as air-conditioning temperature is too low, and you do not cover the quilt when you go to bed at night, which will lead to a cold back. 2. External wind-cold: external wind-cold is a relatively common type of cold, the external wind-cold gas attack on the human body leading to cold, mainly from the meridian invasion, meridian cold will feel the back cold. 3. Yang deficiency in the body: Yang has a warming effect, the body of Yang will cause the entire body cold, from the human yin and yang attributes, the back of the yang, so the back of the Yang deficiency cold will be more serious. If the back is not caused by environmental factors, you should go to the regular hospital in a timely manner, by a professional physician for diagnosis and treatment.