Lymph nodes

Lymph nodes are small, bean-shaped structures throughout your body that are part of the lymphatic system. They act as filters for a fluid called lymph, which contains immune cells that help fight infections. When your body detects an infection or illness, lymph nodes can become swollen as they produce more immune cells to combat the problem. They are found in areas like the neck, armpits, and groin. Lymph nodes play a vital role in immune defense, helping your body detect and respond to pathogens, and maintaining overall health.