Right-sided pain under the armpit may be due to muscle strain, infections, or skin conditions. Sometimes, armpit pain may indicate a more serious issue, such as cancer or a heart issue.

armpit pain isn't a reason to worry, but it can be a sign of a more serious underlying problem. The armpit, also known as the ...

I often suffer pain in my left armpit, particularly when I walk uphill or cycle hard. My GP thought it might be angina and ...