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.
Pain in the upper right back is usually caused by a muscle or bone problem. However, pain in this location is sometimes caused by a condition affecting an internal organ. The body's pain network sends impulses from the source of the discomfort through nerves to the brain.