The pain behind the ear may be caused by lymphadenitis behind the ear, sebaceous cyst behind the ear with infection, herpes zoster in the ear and so on. 1. Behind-the-ear lymphadenitis: a child’s pain behind the ear may be caused by behind-the-ear lymphadenitis, behind-the-ear lymphadenitis can be divided into acute and chronic. Acute lymphadenitis manifests itself as localized pain behind the ear, burning sensation of elevated skin temperature, you can feel an oval-shaped lump behind the ear, and there is obvious pain when pressed. Chronic lymphadenitis behind the ear usually does not have any subjective symptoms. 2. Behind-the-ear sebaceous cysts with infection: children’s pain behind the ear may be caused by behind-the-ear sebaceous cysts. Obstruction of the sebaceous glands behind the ear can lead to retention cysts in the sebaceous glands, which are accompanied by white, pea-like secretions and, if secondary infection occurs, can be painful when pressed. 3. Ear herpes zoster: the child behind the ear pain may also be caused by ear herpes zoster, the patient was infected by the virus, there will be herpes formation behind the ear, and the pain is obvious. There are many causes of pain behind the ear, parents are advised to take their children to the hospital, under the guidance of the doctor to clarify the cause of the disease, and active treatment.