Hidden pain behind the ear may be caused by incorrect sleeping position, enlarged lymph nodes behind the ear, ear diseases and so on. 1. Incorrect sleeping posture: The quality of sleep is affected by long-term incorrect sleeping posture, or too high or too low pillow. It may lead to muscle tension and soreness, so the symptoms of hidden pain behind the ear appear. 2. Enlarged lymph nodes behind the ear: due to staphylococcus aureus and hemolytic streptococcus infection, the lymph nodes behind the ear are enlarged, and under the stimulation of inflammation, the patient may have the symptoms of redness, swelling and vague pain behind the ear. 3. Ear diseases: If you suffer from ear diseases, such as otitis externa, otitis media, etc., it may involve the surrounding mastoid process and cause vague pain behind the ear. Hidden pain behind the ear, such as persistent unrelieved should be timely to the hospital, check the cause of the disease, and follow the doctor’s instructions for treatment.