Lymph nodes are normal tissues in the body and are not cancerous if they do not subside. However, when lymph nodes are enlarged, it often indicates the presence of certain abnormalities in the body. Lymph nodes are oval or fava bean shaped, varying in size, and hard to be touched under normal conditions. They are important immune organs of the human body, generally within 0.5 cm in diameter, mostly distributed in the neck, armpits and inner thighs, etc. The surface of the lymph nodes is smooth and soft, and they mainly have the function of killing bacteria. Its existence will not have any effect on the organism, and it is difficult to perceive if there is no lesion, so it will not become cancerous. And when infection occurs in the human body, lymph nodes will be enlarged and some of them can be touched by hand, which belongs to secondary diseases. However, when painless enlargement or progressive enlargement occurs, malignant lesions are suspected, and there may be problems in the lymphatic system, such as lymphoma. It is recommended to take a light diet, pay attention to rest, avoid staying up late, actively participate in physical exercise, if there is any other abnormality, consult a doctor for examination in time.