Sialolithiasis symptoms typically worsen when you eat and then diminish again a few hours after meals. This is because chewing stimulates your salivary glands to make saliva, which gets backed up in the gland due to the obstruction by the stone. Symptoms may include: Salivary gland swelling. Difficulty swallowing. Trouble opening your mouth. Dry mouth (xerostomia). Strange taste. A painful lump under your tongue. Facial pain or swelling, usually under your jaw or around your ear. In some cases, people with sialolithiasis don’t develop any symptoms at all.