In 1877, Massachusetts passed the Nation's first factory inspection law. It required guarding of belts, shafts, and gears, protection on elevators, and adequate fire exits. Its passage prompted a flurry of State factory acts.
These muscles can cause pain in the right upper back after injuries, such as a muscle strain or bruise from a car accident or fall. Overuse from work or recreational activities, such as painting or playing racket sports, might also be to blame -- especially for people who are right handed.
Right sided pain can be caused by problems with the gall bladder, pancreas, liver, appendix, and sometimes the intestine. If your pain is on the upper right side, then the gall bladder or pancreas are the most likely sources (from a gall stone or pancreatitis).