In daily life, some parents may touch the “small lump” on their children’s neck by accidental bathing or inadvertently, and some of them may be very anxious and worried, and may ask, “Is it a tumor or inflammation?”. In fact, most of these lumps are actually tumors. In fact, most of these masses are actually normal lymph nodes in our body. So how to determine whether they are lymph nodes and whether they are normal or pathological, here is a brief introduction. Lymph nodes are one of the important immune organs of the body, and various injuries and stimuli often cause reactive proliferation of lymphocytes and histiocytes in lymph nodes, resulting in enlarged lymph nodes, called lymph node reactive hyperplasia, especially common in cervical lymph nodes. There are many causes, including bacteria, viruses, toxins, degenerated tissue components and foreign bodies, all of which can become antigens or allergens to stimulate lymphatic tissues to cause reactions. The degree of lymph node enlargement varies, sometimes up to 10 cm. microscopically, the composition and distribution of reactive lymph node hyperplasia varies depending on the causative agent. The lymph nodes in the neck are generally divided into four groups, located under the chin, under the jaw, in front of the neck, and on the lateral side of the neck. In addition, there are lymph nodes in the supra-mandibular area, behind the ear, in front of the ear, in the parotid gland, and behind the occiput. After birth, the structure and function of these lymph nodes are gradually improved, and after 1 year of age, if examined carefully, most children can feel lymph nodes. At older ages, lymph nodes may become less palpable. The growth of lymph nodes may be caused by local or systemic pathologies, such as throat infections, tuberculosis, hematologic diseases, etc. In this case, the growth of lymph nodes becomes an important sign of the disease and is important for diagnosis, and the doctor may even request a lymph node biopsy for diagnosis. In addition to malignant lymphoma, other clinical diseases that need to be differentiated include lymphatic tuberculosis, lymphadenitis, and metastatic cancer. If you find swollen lymph nodes with obvious pressure pain, adhesions, hardness, fluctuating sensation, fusion or rupture of several lymph nodes, and rapid growth within a short period of time, you should seek prompt medical attention.