It is the inflammation of tendons and related tissues. The tendon is a fibrous and very elastic tissue that connects the bone and the muscle together. They are found at the end of the muscle and attaching directly to the bone. We can have acute tendinitis, found in sportspeople and people with physically heavy work. Chronic tendinitis is associated with arthritis and is triggered by repetitive motion, constant wear & tear, or degeneration of the articulation.