What are lymph nodes

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Lymph nodes are small glands that filter lymph. Lymph is the clear fluid that circulates through the body. Lymph nodes contain white blood cells and they act as immune check points which filter out bacteria,virus and other unhealthy cells from our blood.They swell up and can be felt under the skin in our neck , arm pit or groin during infections. Any lymph nodes which are presistently swollen even after the infection settles may be abnormal. If the enlargement is present for more that 10 days you need to meet your doctor.