Lymphatic drainage massage therapy uses light pressure and rhythmic movements to encourage lymph drainage, whereas regular massages focus on the muscles. Lymph is the fluid that flows through the lymphatic system, a system composed of lymph vessels and lymph nodes. Typically, the lymphatic system collects lymph and returns it to the heart. When the lymphatic system is disrupted, lymph collects in the arms and legs, leading to swelling.
Lymph fluid contains white blood cells and other cells to build up the immune system and fight infection. There are hundreds of lymph nodes throughout the body, but they are mainly concentrated in the neck, armpits, chest, belly and groin area.