A dull feeling in your left arm could be from overuse or strain. Learn what causes pain on this part of the arm here and ...

From muscle strains, bacterial and viral infections, and skin rashes, here are 9 possible causes of armpit pain and when to see a doctor.

Armpit pain is a common complaint that can have many causes, from mild muscle injuries to swollen lymph nodes and ... is the hollow area under the junction of arm and the shoulder.