They're located throughout the body in the armpits (called axillary lymph nodes), the groin, neck and chest. The nodes can become swollen and painful, usually when the body is fighting off infections.

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 ...

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.