Wooden and swollen back of the head is a manifestation of abnormal sensation of the scalp at the back of the head, and the sensory nerve of the scalp at the back of the head is the responsibility of the occipital nerve. There are two common reasons for wood and swelling at the back of the head: first, local occipital nerve injury, such as prolonged local scalp pressure and cold, resulting in temporary damage to the branches of the occipital nerve, causing wood and swelling of the scalp, and some will have hyperalgesia. Most recover on their own after the pressure is lifted, local heat or massage to promote recovery. Second, the occipital nerve compression or injury, the occipital nerve is distributed through the upper part of the cervical spine in the posterior occipital region, cervical disc protrusion, cervical spine osteophytes, cervical spine fractures, spinal cord tumors, dural spondylitis, cervical occipital myositis and other diseases, compression of the occipital nerve will cause abnormal sensation or hyperalgesia in the distribution area, manifested as wood, swelling, pain, cervical traction can be treated with anti-inflammatory and pain-relieving drugs.