Pain under the chin can be caused by inflammation of the lymph nodes. It is important to carefully check for enlarged lymph nodes, and if you can palpate the lymph nodes with enlargement and pain, you need to take oral antibiotics to treat them. Because most of the swollen lymph nodes on the surface of the body are infected with Staphylococcus aureus, and there is also a possibility of streptococcal infection, oral cefixime or cefradine is usually sufficient. The regular treatment period is 7-10 days, and after the treatment, the lymph node enlargement can be relieved, and the pain can be reduced. At the same time, it is important to check whether there is any inflammation inside the mouth, such as gingivitis or tonsillitis. If you can find a related disease, you also need to actively treat the original disease.