Pain behind the ear may be inflammation of the lymph nodes. There are lymph nodes behind the ear, and if there is pain, check for red, swollen and painful lymph nodes. Inflammation of the lymph nodes is caused by bacterial infection. The common causative organism is Staphylococcus aureus, which requires oral antibiotics for treatment, including cefixime or cefradine. After 7-10 days of treatment, the lymph node inflammation can subside, the enlarged lymph nodes can return to normal, and the pain can be relieved. Ear pain can also be caused by otitis media, which can cause pain in the middle of the ear and behind the ear, and may be accompanied by pus flow, etc. If necessary, go to the hospital for examination.