The coldness of the back every afternoon may be related to insufficient qi and blood, kidney yang deficiency and so on. 1. Insufficient qi and blood: the role of blood in the human body is crucial, once there is a lack of blood, it is easy to induce the emergence of many diseases. Insufficient qi and blood may cause coldness in the back of the organism. 2. Kidney yang deficiency: The appearance of kidney yang deficiency can also lead to symptoms such as coldness and fear of cold, and the appearance of back cold. Kidney yang deficiency can also cause symptoms such as lumbar and knee weakness (a feeling of soreness and weakness in the waist and knees) and diarrhea. Patients with cold back every afternoon are advised to strengthen physical exercise and maintain good dietary habits. This will enhance the yang energy in the body to a certain extent, thus reducing the appearance of cold back. It is recommended that patients with a cold back every afternoon to receive further examination and treatment in a regular hospital, to clarify the cause of the symptomatic treatment, do not blindly careless, in order to avoid delaying the condition.