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Your lymphatic system plays a large role in immune function and circulation.
It consists of lymph vessels located just under the skin, meeting up with lymph nodes located in your neck, armpits, and groin area. As the lymph vessels move fluid out of the tissues, waste products, bacteria, dead cells, and large protein molecules are collected. The waste products are carried to the lymph nodes to be broken down and eliminated, while the protein rich fluid is transported back to the heart to rejoin circulation.
When the lymph vessels are unable to transport lymph fluid back into circulation it accumulates, resulting in swelling of the extremity.
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