The location of lymph in the neck can be roughly divided into three areas: upper, middle and lower, mainly in the area under the chin and around the chin, the floor of the mouth and between the tongues, etc. Normal people will not touch the lymph nodes when touching the neck, which is very rich in lymph nodes, and lymph nodes will grow in many places. Lymphatic fluid is transparent and colorless, mainly composed of lymphocytes, can flow with the lymphatic reflux everywhere and finally converge into the veins, with immune function and spread throughout the body. If you feel the obvious lymph nodes in the neck, you should be alert, it may be reactive hyperplasia, lymphoma, lymph nodes or tumor metastasis.