The long head of biceps originates from the supraglenoid tubercle and lies adjacent to the rotator cuff.
Bicipital tendinitis can rarely affect young people after shoulder strain. Pain and tenderness are localised to the bicipital groove.
A tear in the long head of biceps caused by degeneration is fairly common. Patients are usually middle aged or elderly and feel something "snap" when lifting a heavy object. When the shoulder is flexed the belly of muscle contracts into a lump which can be mistaken for a tumour but is actually the bunched belly of biceps.