Medically reviewed by Jane Kim, MD You may have swollen armpit lumps due to infections, cysts, or vaccines.In severe cases, ...

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 ...

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 ...