The brachialis muscle: It is the main flexor of your elbow joint. When too tight, it may give you pain at the base of your thumb, in your elbow or at the front of your shoulder.
Because it is covered by the biceps brachii, this muscle is unknown to a lot of people. People who frequently overload this muscle include fitness enthusiasts, guitar players or rock climbers. But anyone can experience trouble in this muscle.
When this muscle is too tight, or has trigger or tender points, it can impair the extension of your elbow. Furthermore, lifting or holding heavy objects with your arm in a flexed position may be painful. Of course, any pulling motion may be impaired or painful too.
Such activities may be