Cupping therapy is a part of CAM and an ancient form of alternative medicine. It is practiced with round glass cups that are shaped like glass balls, which have an opening at one end.
Cupping increases blood circulation to the area where the cups are placed. This may relieve muscle tension, which can improve overall blood flow and promote cell repair. It may also help form new connective tissues and create new blood vessels in the tissue.
Most experts agree that cupping is safe. As long as those treated don't mind the circular discolorations (which fade over a number of days or weeks), side effects tend to be limited to the pinch experienced during skin suction