Muscle cells in the forearm, for example contract and expand to make movement in the hand, thumb, and fingers possible. All muscles have two ends. In the forearm, one end of the muscle attaches near or at the elbow. The other end attaches at the wrist or hand. When muscles contract they pull on their attachments at or around these joints.
Movement is the result.
Sometimes muscle fibers and cells remain tight, contracted and overly acidic due to overuse, stress hormones, quality of diet, environmental pollutants or other factors. When muscles get tight , oxygen and nutrients cannot get in and waste acids build up, making muscles tighter, pulling on their attachments at both ends. Tight muscles pull on their attachments at the elbow and at the wrist, causing pain and a variety of other problems. Constant pulling creates irritation, causing pain, soreness, loss of strength and reducedrange of motion. This condition is usually referred to as tendonitis .