The lymphatic system is an important part of the immune system. It is a network that carries lymph (a clear fluid) through your body. Lymph is most concentrated in the lymph nodes in your body.
Have you ever noticed how these nodes swell when you are sick? When these nodes become enlarged and tender, it means you have an infection. They act as filters for foreign particles and any unwanted cells. The clear fluid picks up bacteria and carries it to the nodes where they get filtered out. When you feel sick, one of the first things a doctor will do is check the spot behind your ears and under your jaw. This spot is the easiest to feel swollen lymph nodes on your body.
The lymphatic system filters out cancer cells in your body. Swollen lymph nodes could indicate anything from the flu to cancer. Even though it's a key part of the immune system, it can be prone to certain conditions. These conditions include lymphedema, leukemia, and various infections.
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