The human brain is one of the most amazing creations in the world and can do so many things that it boggles the imagination, however, it is also an extremely delicate organ that can be easily injured. Lack of oxygen is the most common brain injury that infants suffer during a birth. An adults most common form of brain injury is in the form of a stroke or an aneurysm damaging brain cells, however, trauma to the head or the neck can cause damage to the brain tissue even though there are no cuts or bruises or loss of consciousness the brain injury can be severe to very mild and diffuse.