Neurogenic Shock. This type, often accompanied by fainting, may be brought on by severe pain, fright, unpleasant sights, or otherstrong stimuli that overwhelm the usual regulatory capacity of the nervous system. The diameter of the blood vessels increases,the heart slows, and the blood pressure falls to the point where the supply of oxygen carried by the blood to the brain is insufficient,which can bring on fainting. Placing the head lower than the body is usually sufficient to relieve this form of shock.