Tendonitis is usually a result of a repetitive force constantly putting a strain on a tendon. This, in turn, results in the inflammation of the tissue that connects muscle to the bone. Tendonitis can also be a result of an acute injury.
What is a herniated disc? This can be defined as a condition where one of the pads between the vertebrae moves out of position and messes with the neighboring nerves. This condition is fairly common and can occur anywhere along the spine.