Neck lymph node 7mm, if it is the largest diameter, and no uncomfortable symptoms, most of them are normal; if 7mm is the smallest value, the lymph node is significantly larger is not normal. 1. Normal phenomenon: the maximum diameter of normal lymph nodes is generally less than 10mm, so the cervical lymph nodes 7mm, most of them belong to the normal phenomenon, there is no pain, itching and other uncomfortable symptoms, do not need to worry and treatment. 2. Abnormal phenomenon: neck lymph nodes 7mm if the minimum value, that is, the width or thickness is 7mm, the length is greater than 10mm most of the abnormal, should be considered whether caused by lymphadenitis or neighboring organs disease, lymph node enlargement. Physiological phenomena do not require treatment, if there are abnormal phenomena have uncomfortable feeling, should go to the hospital in time.