The lymph nodes are organs in the body, part of the greater lymphatic system as well as the immune system. They are linked also to the circulatory system and are major sites for white blood cells. They are an important part of a fully functioning immune system. They filter out foreign masses and cancer cells away from the body, mitigating their potential damage. When they are swollen from infection or imbalances in the body they can be felt, hard and tender to the touch; sometimes painful. Crystals can help flush toxins out of the body, relieving the lymph nodes and the immune system in general.