The swollen submandibular lymph nodes are usually not too serious, but it depends on which cause. 1. If the swollen lymph nodes are simply swollen and there is no discomfort in the swollen lymph nodes, they can be left untreated first, just eat a light diet and do not touch them with your hands. However, if the swollen lymph nodes do not improve after a few days, you need to go to the hospital for anti-inflammatory and anti-infection treatment, oral cephalosporin or amoxicillin and other drugs, the course of treatment can generally be recovered in about three days. 2. If the swollen lymph nodes become more and more serious or even have formed an abscess, you need to immediately go to the hospital for surgical treatment, the doctor will cut open the abscess and drainage, and then use anti-inflammatory drugs for treatment. 3. After finding the tooth lesion, the doctor will give the tooth lesion a root treatment, and the symptoms of swollen submandibular lymph nodes will disappear after the cure. Regardless of the cause of the swollen submandibular lymph nodes, it is necessary to pay attention to a light diet during the treatment period and not to consume spicy and stimulating foods in order to facilitate the recovery of the swelling.