Painful pressure on the neck behind the left ear is not very common clinically. Patients are advised to visit relevant departments such as otolaryngology, general surgery, orthopedics, etc. to exclude the possibility of related diseases. The first kind of pain is caused by inflammation of the lymph nodes around the back of the ear, for example, secondary to acute otitis externa, acute otitis media, acute mastoiditis, etc. If the lymph nodes are inflamed, there will be clinical pain when pressing, and the primary lesion can be found. Secondly, some patients may have soft tissue or bone damage in these areas induced by sleeping pillow, or previous cervical spondylosis, etc. Third, some patients have interstitial infections in the neck, such as parapharyngeal interstitial infections, which can cause subcutaneous discomfort when pressed. Other diseases have patients such as having inflammatory infections of the epidermis and skin in these areas, and viral infections can also occur.