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 ...

An armpit lump—or axillary lump—can occur as a symptom of many conditions that range from harmless to serious. It is often the result of an enlarged lymph node. Many armpit lumps appear and then go ...