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.
Conditions like inflammation of liver (hepatitis), enlargement of liver (hepatomegaly), liver cirrhosis, fatty liver or infections, toxins, drugs and alcohol affecting the liver can cause liver damage and pain under right rib cage in the right upper part of the abdomen.