This injured and stagnant area can inhibit your body's natural healing process, and slow down recovery. Cupping invigorate the blood circulation, and creates space for your circulatory system to bring fresh blood, oxygen, and nutrients to the area to expedite the healing process.
Is it painful? What about the big bruises it causes?
Cupping also relieves tight and sore muscles, by pulling the muscle fibers into the cup with suction. This loosens the muscles and relieves pain. It also pulls the stuck blood within the muscle onto the surface of the skin. This occurs when an injury ruptures small blood vessels within the muscle fibers, causing blood to collect in the muscle and "glue" the already tight muscle fibers together. Cupping is able to pull the congealed blood out of the muscle and onto the surface of the skin. This is why people who have recieved cupping therapy appear to have bruises on the area. The cups aren't actually causing the bruises, but they are pulling out the old stagnant blood that was already stuck in that area. The bruise-like marks are not actually as tender as a bruise would be, and the cups do not cause these marks in areas that were not stagnant or restricted. Areas with no stagnation present will only show a pink coloration which disappears wthin a few minutes to a couple of hours.