Thyroid problems can cause swelling in the neck when the thyroid gland becomes enlarged. This may happen because of conditions such as a goiter, thyroid nodules, or certain thyroid disorders. The swelling may appear as a lump or fullness at the front of the neck and can sometimes cause difficulty swallowing or a feeling of pressure. Not every swelling is caused by the thyroid, so it is important to find the exact reason. If you notice Neck Swelling that is new, growing, or persistent, consult a doctor for proper examination and thyroid tests when needed.