If your neck feels swollen, you may have a thyroid lesion, such as a thyroid nodule or a thyroid mass. Check the front of the neck downward, on both sides of the trachea, to see if there is a mass that can move up and down when you swallow. If the nodule is caused by a thyroid nodule, an ultrasound examination of the thyroid gland should be performed first to determine the benignity or malignancy of the nodule. If the nodule is benign, such as a nodular goiter or thyroid adenoma, the nodule can be followed up when it is small and does not require surgery. If the nodule is large, more than 4 cm, or if there are symptoms of pressure, it needs to be removed surgically. If the nodule is malignant, i.e., thyroid cancer, radical thyroid cancer surgery is required.