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- Cancer Information
For medical questions, we encourage you to review our information with your doctor.
- What Is Cancer?
- Can Cancer Be Cured?
- Understanding What Cancer Is: Ancient Times to Present
- Understanding Cancer Causes: Ancient Times to Present
- History of Cancer Epidemiology: 18th Century to Present
- History of Cancer Screening and Early Detection: 20th Century to Present
- History of Cancer Treatments: Surgery
- History of Cancer Treatments: Hormone therapy
- History of Cancer Treatments: Radiation Therapy
- History of Cancer Treatments: Chemotherapy
- History of Cancer Treatments: Immunotherapy
- History of Cancer Treatments: Targeted Therapy
- Advancement of Cancer Survivorship
- Finding Cancer Information on the Internet
Lymphatic System
The lymph system is part of the immune system, which helps fight infections and some other diseases. The lymph system also helps control the flow of fluids in the body.
Lymphatic structures, organs, and tissues include the:
- Lymph nodes
- Lymph vessels
- Spleen
- Thymus
Lymph nodes are bean-sized collections of lymphocytes and other immune system cells. They're found throughout the body, including inside the chest, abdomen (belly), and pelvis.
Lymph vessels are a network of tiny tubes (a lot like blood vessels) that connect lymph nodes and carry immune cells in a clear fluid called lymph. Lymph is collected from around the body and put into the bloodstream.
The spleen is an organ that's under the lower ribs on your left side. The spleen is part of your immune system.
The thymus is a small organ behind the upper part of the breastbone and in front of the heart.
The American Cancer Society medical and editorial content team
Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as editors and translators with extensive experience in medical writing.
Last Revised: December 13, 2022
American Cancer Society medical information is copyrighted material. For reprint requests, please see our Content Usage Policy.
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