If otitis media occurs after a cold, the inflammation can spread to the mastoid process and lead to mastoiditis, which can lead to redness and swelling of the mastoid area and pain when pressed, which is mostly septic infection and needs to be treated thoroughly to avoid intracranial infection. There are many hair follicles behind the ear, and if folliculitis occurs, it is also mainly inflammatory and painful when pressed. Second, swellings, various benign and malignant swellings appear in the area behind the ear, which can cause involvement of the scalp and can lead to sterile inflammation and pain when pressed. Vascular spasm, when the patient lacks sufficient rest or when the head is cold, it can lead to spasm of the blood vessels in the area behind the ear, which can be manifested as pain behind the ear, mostly in the form of ergogenous pain, and some patients can have pain on pressure.