Today, cupping is mainly used and recommended for treatments ranging from pain, gastro-intestinal disorders, lung diseases (especially chronic cough and asthma), and paralysis, and many other disorders as well.
When the cupping jar draws up the underlying tissue, blood stasis will form and the cupped area will appear bruised. It is said the darker the area gets, the more stagnant the blood is in that area and the more toxins are released.
While cupping normally results to bruising and some swelling, the actual session is not painful. As for the bruises, they are minor, harmless and will disappear in a few days.