Lifting your suitcase into the overhead compartment, stuffing your shoulder bag to capacity, allowing your 80-pound golden lab to yank his way through a daily walk. None of these qualify as risky behavior, but now that you're over 50 you're paying the price. What gives? In short: Your shoulders.
The single greatest medication that you can do as you age is to exercise, which will help you counter so much of the inexorable decline of father time. But the truth of the matter is, even if you exercise as you age, you can't always get away with the same exercises you used to do in your 20s and 30s.
Various things can cause pain in the middle of the bicep, which is the muscle at the front of the upper arm. Muscle strains and bruises, for example, are common causes of bicep pain.