First, the Du meridian intersects with the three Yang meridians of the hands and feet and Yangwei meridians for many times, and is related to all Yang meridians, so it plays a regulatory role in the qi and blood of the whole body Yang meridians.
Secondly, it reflects the function of brain marrow and kidney. Kidney is the innate foundation, which governs the medullary brain and reproduction, so reproductive system diseases such as strong spine, syncope, infertility due to essence cold and so on are closely related to Du meridian. The brain is the high-level center of human beings, and the spinal cord is the low-level center. The route of Du meridian overlaps with the spinal cord. Therefore, Du meridian has a very close relationship with people's mind and mental state.
Du meridian is full of yang, as long as the yang is weak, you can find suitable acupoints on Du meridian for treatment.
There is a good physical therapy method called back wax therapy for Du meridian conditioning, and its mechanism is to open Du meridian and bladder meridian.