Left armpit pain can occur with conditions like allergic reactions, infections, and muscle strain. Some severe causes may have additional symptoms, including a breast lump or difficulty breathing.

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. The armpit ...

Pain under the left armpit may result from muscle damage or swollen lymph nodes due to an infection. However, it can also indicate a more serious problem, such as cancer or angina. The armpit is a ...