Certain areas and acupoints on the foot can correspond to internal organs. For example, the big toe belongs to the foot area of ​​the upper body, and the heel area corresponds to foot problems. Huang Jingxuan, director of the Department of Traditional Chinese Medicine and Traumatology at the China Medical University Hospital, also pointed out that stimulating acupoints on the skin surface through pressing or acupuncture can also stimulate the reaction of internal organs. In clinical practice, it is also common to see that pressing the arch of the foot can relieve some people’s low back pain. This is called holography or reflexology.