Gua sha Gua sha (刮痧; guāshā) is abrading the skin with items of sleek jade, bone, animal tusks or horns or easy stones; right until red places then bruising go over the area to which it is completed. The Triple Warmer governs Blood Vessels and Arteries. From 9 to 11 pm the blood vessels go into mend manner. If you will get headaches, s