Under normal circumstances after scraping gua sha pay attention to protection is not easy to cause a cold, but after scraping gua sha patients due to the skin coupling is not solid (often refers to the skin can not consolidate the sweat, the body surface sweating abnormality), plus the wind cold is easy to lead to the occurrence of a cold. Gua Sha has dredge meridians, blood circulation (promote blood operation, eliminate blood stasis), clear heat and detoxification (remove body heat and toxicity), accelerate the role of local blood circulation, belong to the Chinese medicine external treatment method of a kind. Weak patients after scraping gua sha, skin coupling belongs to open state, if not pay attention to protection, easy to lead to the outside of the cold, wind, dampness and other evil invasion of the body, which led to the occurrence of cold. Therefore, after scraping the patient should pay attention to protection, to avoid the invasion of external evil. If there is a cold and other illnesses, it is recommended to go to a regular hospital, under the guidance of a professional physician identification and treatment.