<Li> Pain, which is intermittent, and may suddenly get worse before mealtimes, and then slowly get better (partial obstruction). </Li> <Li> Swelling of the gland, also usually intermittent, often suddenly appearing or increasing before mealtimes, and then slowly going down (partial obstruction). </Li> <Li> Tenderness of the involved gland . </Li> <Li> Palpable hard lump, if the stone is located near the end of the duct . If the stone is near the submandibular duct orifice, the lump may be felt under the tongue . </Li>

Recurrent unilateral submandibular swelling and pain just prior to meals is indicative of