Scraping requires precautions including preoperative precautions and intraoperative precautions and postoperative precautions. Preoperative precautions 1. fully exposed scraping parts, choose air circulation, fresh treatment place, pay attention to warmth, summer can not be in the place of the wind scraping. 2. the operator’s hands should be sterilized, gua sha tools should also be strictly disinfected to prevent cross-infection, scraping before the scraping should be strictly carefully check the scraping tools, so as not to scratch the skin. 3. Do not in the patient too hungry, too full, as well as excessive tension in the case of gua sha treatment. Precautions during the operation 1. Scraping techniques to force uniform, to the extent that the patient can tolerate, out of gua sha until, infants and young children and the elderly scraping techniques should be light. 2. Not to pursue the Gua Sha and use heavy hand or prolong the scraping time. 3. scraping process, such as the dizzy scraping, mental fatigue, dizziness, pale, nausea and vomiting, cold sweat, panic, cold limbs or blood pressure drop, consciousness coma, should immediately stop scraping, soothe the patient not to be nervous, so that the lying down, pay attention to warmth, drink warm boiled water or sugar water, generally can be restored. Post-operative precautions 1. gua sha treatment to make sweat hole open, evil outward, to consume the body fluid, so after gua sha drinking warm water, rest for a moment. 2. after the gua sha treatment, to wait for the skin pores to close and restore the original state, before bathing, generally for about 3 hours.