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.
There is one key thing to remember though: the cause of your upper right side back pain may not have happened right at that moment. It may have built up over a period of time, and suddenly reared its ugly head. Upper back pain can be defined as when you are unable to move a part of your upper back and function normally.