The cause of numbness and swelling at the back of the neck may be due to the following two aspects. First, consider that it may be because the posture is too long, causing the back of the patient’s occipital and shoulder muscles to be in a state of tension, and the head skin and scalp will also be in a state of tension, so the patient will feel the problem of numbness and swelling in the back of the neck. After the activity, the symptoms can be relieved. Secondly, if the patient suddenly has severe numbness and swelling at the back of the neck, accompanied by vertigo. The cerebellum is located at the back of the cranial fossa. If there is a disease in the cerebellum, such as an occupancy of the cerebellum or hemorrhage or infarction in the cerebellum, there will be numbness and swelling in the back of the head, but there should be dizziness at the same time.