There are many causes of postauricular root pain. The specific causes need to be clarified with the actual situation of the patient to avoid misdiagnosis, as follows: 1. Acute and chronic otitis media, in addition to ear pain, tinnitus and other discomfort, inflammation can also lead to swelling of the lymph nodes behind the ear and symptoms of postauricular root pain; 2. Swelling of the lymph nodes behind the ear due to inflammatory factors, in addition to otitis media, gingivitis, tonsillitis, upper respiratory tract infection, etc. can also cause The pain behind the ear is usually not difficult to diagnose when combined with the patient’s symptoms and signs; 3. The sebaceous cyst behind the ear is caused by the blockage of the hair follicle behind the ear, which is prone to infection if the patient does not pay attention to hygiene and care, resulting in pain and discomfort behind the ear and around the cyst. Damage or head and face injury, due to external impact also cause dizziness, tinnitus, ear root pain, discomfort, etc., need to promptly perform cranial CT examination to clarify the diagnosis to avoid delaying the condition.