Initially, the vacuum application of the cup pulls blood into an area. This leads to the affected tissue becoming saturated with fresh blood. This saturation can often leave a circular mark. However, this usually starts to disappear after a day or so and happens to a lesser extent on repeated treatments.
Due to the vacuum effect, the soft tissue often experiences micro-trauma and separation between the tissue layers. The body responds to this micro-trauma by stimulating an inflammatory response, which is the natural process of healing. During this stage, the body releases chemicals such as white blood cells to initiate healing.
Finally, the stretch that is produced in the soft tissue and fascia leads to a relaxation effect within the muscle, which results in improved range of motion and performance.