Guasha is an ancient healing technique used in traditional Chinese medicine. In the treatment, special oil is put on a particular area of the skin, and the therapist starts "scraping" the area repeatedly with a "scraper" (a specially designed instrument of jade or horn). Patients hardly feel pain, neither during nor after the treatment. This process can improve local microcirculation instead of causing tissue damage. In most cases the patient feels an immediate improvement in their condition particularly in their pain or sense of constraint.