Lymph nodes are part of the lymphatic system, which carries lymph
fluid, nutrients, and waste material between the body tissues and the
bloodstream. The lymphatic system is also an important part of the immune
system, the body's defense system against disease.
The lymph nodes (sometimes called lymph glands) filter lymph fluid
as it flows through them, trapping bacteria, viruses, and other foreign
substances, which are then destroyed by special white blood cells called
lymphocytes. Lymph nodes may be found singly or in groups; they may be as small
as the head of a pin or as large as an olive. Groups of lymph nodes can be felt
in the neck, groin, and underarms. Many lymph nodes in the body can't be
felt.
When a part of the body is infected, the nearby lymph nodes become
swollen as they collect and destroy the infecting organisms. For example, if a
person has a throat infection, the lymph nodes in the neck may swell and become
tender.
Cancer can spread through the lymphatic system.