Lymph nodes are small, bean-shaped structures in the lymphatic system, a part of the immune system.
They filter and trap foreign particles, such as bacteria, viruses, and cancer cells, from the lymph fluid, which circulates throughout the body.
Lymph nodes are found in various regions, including the neck, armpits, and groin, and are connected by lymphatic vessels. When the immune system detects an infection or abnormal cells, lymph nodes often become swollen and tender as they work to fight off the threat.
They play a vital role in immune responses and overall health.