The lymphatic system truly has a most key role in the immune system and checking inflammation as, beside balancing fluids and carrying "protein molecules, salts, glucose and other substances," it flushes pathogens (invaders) away to be dealt with(1). It is considered part of the circulatory system(1,2) and has its own "veins, arteries and capillaries" much smaller than blood vessels for circulation of lymph fluid(1); capillaries push the fluid into surrounding tissue, where it collects toxic and infectious substances into traps(1,2) in such places as "the throat, groin, armpits, chest and abdomen"(1) - those traps are the lymph nodes, and they have more ingoing than outgoing portals so that lymph fluid stays around inside(1,2) for dealing with of the nasty substances brought in before return to circulation(2).
There are further elements to the entire lymphatic system besides vessels and nodes. Tonsils execute pre-digestion filtration of bacteria(1). [They aren't so vestigial after all!] Adenoids guard "the entrance to the digestive system and lungs" from a position behind the nose. Spleen and thymus "scan the blood and produce white blood cells"(1).
Temporary elevation of stress from fear, including such kinds as anticipation from riding a roller coaster, causes the immune system to ramp up; escalation of heart rate attends the spleen releasing extra red and white blood cells, the red increasing oxygen levels and the white increasing the power brought to bear on impure substances. Prolonged stress instead checks the power of immune response. Modern life means unprecedented double duty for the immune system as it now faces multiplied exposure to toxic substances(2). This means natural detoxification is part of immune health. Lymph nodes swell with infections. Illness and injuries cause swelling of fluid which causes pain(1). Two minutes spent on a mini trampoline actually stimulates the lymphatic system, flushing it and tripling white blood cells in the body. Spreading out two-minute bouncing sessions works better than one big chunk for the day(2).
Please see nutrients to fuel the immune system in our previous article from two weeks ago, "Immune System Part 3: Immunity Nutrients."
References:
1. Levy, Jillian. "The Lymphatic System: How to Make It Strong & Effective." Dr. Axe. Dr. Axe. 24 Oct. 2015. Web. 23 Aug. 2021. https://draxe.com/health/lymphatic-system/.
2. "Strengthen The Lymphatic System." Promolife Blogs & Articles. Promolife, Inc. Web. 23 Aug. 2021. https://www.mypromolife.com/blog/2014/12/strengthen-the-lymphatic-system.