An enlarged submandibular gland is commonly caused by a bacterial infection, a salivary stone blocking the duct, or a viral illness. Typical symptoms include swelling under the jaw, pain (especially while eating), a foul taste, or fever. This condition is very common and highly treatable. If a bacterial infection is the cause, doctors frequently prescribe generic antibiotics such as amoxicillin-clavulanate. If you have a penicillin allergy, alternatives like clindamycin or cephalexin are often used. Sucking on sour candies, staying well-hydrated, and applying warm compresses can also help clear the gland. Please consult a healthcare professional for a tailored evaluation.