The Progressive Era. During the period known as the Progressive Era (1890s to about 1920) the U.S. government became increasingly activist in both domestic and foreign policy.
One possible link between brain freeze and other headaches is local changes in brain blood flow. If further research confirms all these types of headaches are caused by blood flow changes, new drugs that block widening of the blood vessels - called vasodilation - could improve treatment for sufferers.
Brain death can occur when the blood and/or oxygen supply to the brain is stopped. This can be caused by: cardiac arrest â when the heart stops beating and the brain is starved of oxygen. heart attack â a serious medical emergency that occurs when the blood supply to the heart is suddenly blocked.