The presence of a foreign body at the root of the neck may be caused by the following reasons: First, it may be a problem of the throat, such as chronic pharyngitis resulting in enlarged tonsils, generally the tonsils reach degree II or III enlargement, there will be a foreign body feeling in the throat, in addition to the polyps in the throat may also lead to foreign body feeling. Second, it may be a swelling in the thyroid gland, such as thyroid nodule, thyroid adenoma, or even thyroid cancer. If the local swelling is large, it may press on the local trachea or esophagus and cause a foreign body sensation. Third, if there is an abnormal enlargement of lymph nodes in the upper part of the neck or the lower jaw, a foreign body sensation may also occur.