Lymph Nodes: Function, Location, and Importance

Lymph nodes (lymph glands) are small, round organs of the lymphatic system. They filter waste and harmful substances from blood and tissues. Concentrated in the neck, armpits, and groin.

Composed of immune cells (lymphocytes, macrophages, dendritic cells) that identify/destroy foreign substances (bacteria, viruses, cancer cells). Upon detection, they multiply and produce antibodies.

Lymph nodes swell and become tender when fighting infection—sign of immune response. Enlarged/hard nodes may indicate serious conditions like cancer.

They are vital to the immune system, protecting against infection and disease.