A stabbing pain in the head is mainly due to the following reasons: First, cerebral vascular spasm, such as traumatic brain injury, subarachnoid hemorrhage or long-term chronic cerebral blood supply deficiency can easily cause cerebral vascular spasm, which is manifested as a stabbing pain inside the head, some patients have a stabbing colic or pulling pain, accompanied by nausea and vomiting in severe cases, and TCD examination can reveal the presence of cerebral TCD examination can reveal the presence of vascular spasm in the brain. If there is a sudden burst of stabbing pain inside the head, consider whether it is a subarachnoid hemorrhage caused by aneurysm rupture. The main manifestation of subarachnoid hemorrhage is a stabbing pain in the head, some of which are mainly stabbing pain and some are mainly explosion-like pain.