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Cupping Negative pressure forms a vacuum-sealed barrier between the cup and the skin. This suction causes blood vessel dilation which warms and promotes the free flow of qi and blood in the meridians and diminishes swelling and pain. Stationary or sliding glass, bamboo, or plastic cup therapy can promote notable relief from shoulder, back, stomach, and leg tension, vomiting, menstrual cramps, cough, asthma, and acute sprains.
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