Lymph is all over the body and exists in every part of the body, but there are eight lymph nodes that are more important to the body. They are located in the mandible, parotid gland, side of the neck, behind the ear, supraclavicular fossa, armpit, diamond-shaped depression in the back of the knee area, and groin, which are easier to be touched compared to other lymphatic locations, so they are always used clinically as a basis for diagnosis. As a toxin recycling station, lymphatic fluid collects toxins from the whole body into lymph nodes, which are then discharged from the body by the blood through the kidneys and skin. Once the lymph in the body becomes painful, swollen and hardened, it is necessary to consider lymphatic problems, firstly, go to the hospital for examination, listen to the doctor’s advice for treatment, and prevent recurrence in life by changing living habits and healthy diet.