Used for pain relief and removing toxins and increasing circulation. Gua sha is typically performed by rubbing a smooth-edged instrument across the skin surface where a subcutaneous injury or imbalance resides. When treatment is effective, distinctive reddening of the skin, known as sha, is observed. This is a positive response and brings the immediate and lasting benefit of dispelling wind, reducing heat and inflammation, eliminating coldness, and releasing pain from the superficial and deeper levels of the body. Gua sha is used to treat many acute and chronic health problems including colds and flu, fever, headache, indigestion, dizziness, injury, joint pain, fibromyalgia and heat exhaustion. It is also commonly performed to relax tight and aching muscles and to relieve tiredness and fatigue. The stroking action of gua sha to the points and channels can also be practised as a health enhancement method, and can even be performed through light clothing (without the intention of raising sha).