Numbness at the back of head can be a sign of a brain aneurysm, a stroke or an arteriovenous malformation, also known as a brain AVM, says the Mayo Clinic. A brain AVM is a condition caused by blood vessels in the brain that do not properly connect or are malformed.
Numbness at the back of the head can be a result of migraine headaches or seizures, suggests Healthline. In some cases, numbness is directly related to a recent head, back or neck injury. Other symptoms associated with head or back injuries include difficulties in vision and speech. The person often finds it difficult to move, experiences weakness and feels confused. Sometimes he loses consciousness or has severe pain. A person with these symptoms needs to consult a physician immediately or visit an urgent care center. This type of injury, especially when it affects the spinal cord, needs to be treated as soon as possible to maximize recovery, according to the Mayo Clinic.
A brain AVM causes not only numbness, but also headaches, vision and speaking difficulties, weakness and unsteadiness, states the Mayo Clinic. Although it can result in brain bleeds, hemorrhages and blood vessel ruptures, the majority of people with AVM are fairly stable and experience few symptoms. Severe cases can be treated if caught in time.