The pain and swelling inside the ear may be caused by otitis externa, suppurative otitis media, ear tumor and so on. 1. Otitis externa: bacterial infection of the external ear canal or damage during ear digging can lead to bacterial infection, redness, swelling, heat and pain, and may also secrete pus, causing pain and swelling of the ear. 2. Suppurative otitis media: Suppurative otitis media is caused by inflammation of the mucous membrane of the middle ear, and the patient will have pain in the ear and yellowish-green secretion, which will lead to pain or swelling of the middle ear. 3. Ear tumor: If there is a tumor in the ear, especially in the middle ear, with the growth of the tumor, it will compress the surrounding tissues and cause the ear pressure to increase, which will result in swelling and pain. It is suggested that patients should go to the hospital in time to find out the cause of swelling and pain, and take corresponding treatment measures under the guidance of doctors.