Stones can form in the salivary gland ducts. Salivary gland duct stones often occur in the parotid and submandibular glands, with the submandibular gland being the most common. Clinical manifestations: 1. Repeated swelling and discomfort in the affected submandibular area, significantly aggravated by eating, and even pain; 2. 30 minutes after eating, the symptoms are gradually relieved; if completely obstructed, colic may occur; 3. Examination of the sublingual meatus at the floor of the mouth, local congestion, redness and swelling, and even purulent discharge; 4. shadow. Treatment: 1, small, sediment-like stones can be treated with acidic food to increase saliva flow and promote stone discharge; 2, stones located in the front end of the glandular duct, small incision in the mouth to remove the stones; 3, stones located in the back end of the glandular duct, or even intra-glandular stones, will require hospitalization, using an incision in the submandibular area, together with the submandibular gland, stones and ducts removed.