The biceps muscle is located in the front of the upper arm and goes from the elbow to the shoulder. The biceps muscle is composed of two muscles — the long head and the short head. Each head of the biceps muscle has a tendon that attaches the muscle to the shoulder. The long head attaches to the glenoid and is a common cause of shoulder pain. The short head attaches to a point on the scapula, called the coracoid process, and typically does not cause shoulder pain. The biceps muscle attaches at the front of the elbow with one tendon.
When the tendons that connect the biceps muscle to bone become inflamed, this is referred to as biceps tendonitis. Biceps tendonitis can occur at either one of the tendon attachment locations — the shoulder or the elbow.