The sublingual gland is a salivary gland under the tongue, and the foreign body sensation of the sublingual gland is mostly caused by inflammation of the sublingual gland and cyst of the sublingual gland. 1. Inflammation of the sublingual gland: the sublingual gland secretes saliva into the mouth through the salivary gland duct under normal conditions. When the duct is blocked, the sublingual gland will be infected with inflammation, which will cause localized swelling of the sublingual gland and enlargement of the sublingual lymph nodes, and the symptom of foreign body sensation of the sublingual gland will appear. 2. Sublingual gland cyst: due to the damage of the gland or duct rupture, mucus into the tissue to form the sublingual gland cyst, the cyst wall is thin, fluctuating sensation when touching, it will produce the symptom of sublingual gland foreign body sensation. When the symptom of foreign body sensation in the sublingual gland occurs, it is necessary to go to the hospital in time for examination, to clarify the cause of the disease, and actively cooperate with the doctor for treatment.