Swollen lymph nodes (medically known as lymphadenopathy ... which causes irritation and discomfort in the armpit. Common ...

Finding a lump in your armpit can be worrisome, especially if it's painful or appears unexpectedly. The lump could be a sign or symptom of conditions like breast cancer or hidradenitis suppurativa ...

For instance, people with breast cancer will typically get swollen lymph nodes in the adjacent armpit, while people with lung cancer will typically experience lymphadenopathy in the chest cavity.

At the time, doctors put it down to a side effect called axillary adenopathy, also known as swollen lymph nodes. Swollen lymph nodes can occur in your armpits as well as in your neck and groin.