What is a lymph node?

Lymph nodes (LNs) are small, bean shaped glands located throughout the entire body. They form a part of the lymphatic system which transports nutrients and waste around the body. LNs serve as a major player in our immune system and houses many white blood cells (WBCs) which help to monitor the fluid that passes through a LN in search of any "bad stuff" present (such as an infection, tumor, waste products etc). If encountered, they can then activate a response in the body to help remove the unwanted offender.