The armpit is a complex junction where muscles, nerves, blood vessels, and lymph nodes meet. Because it is such a busy area of the body, experiencing pain there is surprisingly common. For some, it is ...

There are several causes of pain in the breast and armpit. Some of the most common causes include hormonal changes, an ill-fitting bra, or a muscle strain. Share on Pinterest Yauheni Rak/Getty Images ...

Jessica Zabel had both of her breasts removed in 2014 after a cancer scare. She had hoped the surgery would make her life easier, but it caused constant, burning pain under her armpit, she told Today.