A mass in the neck that is active may be a lymph node or a thyroid nodule. Lymph nodes are hard under the skin, very mobile, and cannot be touched under normal circumstances. If the lymph nodes are swollen to the touch, there are diseased lymph nodes, which may be caused by inflammatory infections. The swollen lymph nodes will be accompanied by pain and pressure, and require oral antibiotic treatment, such as cefixime. If there is no pressure pain when the lymph nodes are swollen, it may be caused by tumor metastasis, and further examination of the thyroid gland for nodules is needed. If it is considered to be caused by metastasis of thyroid cancer, radical nail cancer surgery is needed. It is also possible that the nodule is a mass of thyroid nodules, which will slide and move very well when pressed. The nodule can move up and down with swallowing and is located mainly in the anterior lower part of the neck, either on the left side of the trachea or on the right side of the trachea. Ultrasound of the thyroid gland is required to determine the benignity of the nodule. If the benign nodule is small, it can be followed up. If it is more than four centimeters, patients with symptoms of pressure can be operated. If the nodule is malignant, radical thyroid cancer surgery will be required.