A pang of pain in the head by the left ear is characteristic of the branches of the occipital nerve, the small left occipital nerve and the large left auricular nerve pain. The small occipital nerve and the large auricular nerve are both derived from the cervical 2 and cervical 3 spinal nerves of the cervical segment of the spinal cord. Among them, the small occipital nerve pain is mainly manifested as pain in the area of the mastoid process behind the ear, and the large otolaryngodynia is mainly manifested as pain in the ipsilateral external ear. The most common cause is cervical spondylosis and diseases of tissues near the cervical spine, which compress or provoke stimulation of the occipital nerve, causing a corresponding painful pang in the left side of the ear, such as cervical spondylosis, cervical tuberculosis, cervical tumors, and cervical fractures. In addition, spinal cord tumors, cervical-occipital myelitis, and metastases can also compress or damage the occipital nerve. There are also infectious diseases of the head and face that affect the occipital nerve and cause inflammation of the occipital nerve, which can also manifest as a pang of pain in the ipsilateral ear, such as common cold, tonsillitis, periodontitis and other infectious diseases.