Lymph nodes 0.5×1.7 cm on ultrasound are considered to be related to inflammation and malignancy. Inflammation is usually less serious, while malignant tumors are more serious. 1. Inflammation: If the lymph node is enlarged due to inflammation and infection, it tends to have clear boundaries and regular internal echoes. Generally, the condition is not too serious. 2. Malignant tumors: lymph node enlargement caused by malignant tumors is considered to be related to lymphoma to a certain extent, and may also be related to lymphatic metastasis of malignant tumors. Lymph nodes with unclear boundary and irregular internal echogenicity need to be diagnosed according to the nature of puncture. The condition is usually serious. When clinicians find enlarged lymph nodes, the first thing they can also do is to palpate the enlarged lymph nodes to determine how the mobility is whether it is adherent or not, whether the border is clear or not, whether there is any pain or not, and initially determine the cause of the enlarged lymph nodes. When you find swollen lymph nodes, it is recommended that you consult a doctor in time, complete the examination, make a clear diagnosis and then follow the doctor’s instructions for treatment.