Medically reviewed by Marla Anderson, MD Cysts (fluid-filled tissue pockets), infections, and swollen lymph nodes commonly cause armpit lumps. Finding a lump in your armpit can be worrisome, ...

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 ...

A new bimodal model using CEUS images improves early detection of lymph node metastasis in breast cancer patients.

in which a few lymph nodes in the armpit are removed to check for spreading cancer. Removing lymph nodes can cause lasting pain and arm swelling, so research is underway to determine when it can ...