Back clogging can be used to scrape or cupping method to dredge the meridians. 1. Scraping is the use of ox horn or stone made of gua sha board, coated with gua sha oil on the back to scrape, can follow the back of the bladder meridian and the ducal meridian for repeated scraping, some people will appear gua sha marks. Scraping can dredge the meridians, improve local blood circulation, adjust the function of the body. 2. Cupping is a glass jar as a tool, the use of alcohol in the jar burning or pumping the way to generate negative pressure so that the jar adsorption on the skin surface of an operation. Through 8 to 15 minutes of adsorption, the local skin is congested, local blood circulation is improved, and benign stimulation is produced to the human body, so as to achieve the purpose of treating related diseases or improving the function of the body. Gua Sha or cupping needs to be operated by professional Chinese medicine practitioners or massage therapists, do not operate on your own to avoid adverse consequences.