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What it is This condition means that the tendon of the long head of your biceps (the upper arm muscle) is irritated or inflamed. The problem can be caused by an injury or by repeated overuse — small strain after strain over time. Usually, this issue isn’t serious, but because it can stop you from doing sports or daily activities, it’s important to treat it properly. Anatomy (How it’s built) The biceps muscle has two parts: The long head  (which has a longer tendon) The short