Often, armpit pain is a simple case of a strained muscle. "The most common causes ... you can feel more pain in the chest area or under the arm," says O'Hare. Pain often occurs in both armpits ...

Armpit pain can also be caused by acute injuries to muscles or ligaments during weightlifting ... you can feel more pain in the chest area or under the arm," says O'Hare. Pain often occurs ...

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