Armpit pain is a common complaint that can have many causes, from mild muscle injuries to swollen lymph nodes and severe skin infections. In most cases, armpit pain isn't a reason to worry, but it can ...

Address abscesses. People with underarm hidradenitis suppurativa often develop armpit abscesses, painful lumps under the skin that are filled with pus. Usually caused by a bacterial infection, they ...

Medically reviewed by Theresa Marko, PT, DPT, MS Key Takeaways Armpit pain can appear with symptoms like tenderness, swelling, and redness. Causes include injuries, infections, or swollen lymph nodes; ...