Abnormal lymph nodes in the left cervical region IV indicates that the imaging findings of lymph nodes are different from the normal pattern, which may be seen in lymphadenitis, infectious diseases, tumor metastasis and other diseases. 1.Lymphadenitis:Lymphadenitis is a localized inflammatory reaction of the lymph nodes, in which the patient may feel pain and swelling in the lymph nodes of the neck, with localized redness, swelling, skin warmth, and pain as clinical manifestations. Diagnosis of lymphadenitis can be made by blood test and lymph node biopsy. 2. Infectious diseases: such as facial inflammation, tuberculosis and other infectious diseases can lead to swelling of lymph nodes in the neck. Patients with tuberculous lymphadenitis are often accompanied by a history of tuberculosis, and may have low-grade fever, night sweats, and fatigue. Diagnosis of tuberculous lymphadenitis can be made through the detection of tuberculosis bacilli and lymph node biopsy. 3. Tumor: Tumor can be transferred to the lymph nodes in the neck, and the clinical manifestation is that the lymph nodes do not hurt when pressed, and there are adhesions with the surrounding tissues. The primary tumor can be found through imaging and tumor markers, and lymph node biopsy can be performed to determine whether the lymph node abnormality is caused by the tumor. Lymph node abnormality in the left cervical lymph node IV area is also seen in other causes, it is recommended to consult a doctor in time and standardize the treatment and medication under the guidance of a professional doctor, so as to avoid delaying the condition.