Medically reviewed by Marla Anderson, MD Cysts (fluid-filled tissue pockets), infections, and swollen lymph nodes commonly ...

There are around 600 lymph nodes located throughout the body, many of which are clustered in the armpit, groin, and neck. They vary in size from a few millimeters to up to 1.5 centimeters in diameter.

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 ...