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.
Automatic movements such as blinking, sweating - Brain. Cramps in both abdominal area and in hands, legs, feet. Constipation: Brain (because of muscle rigidity and Digestive organs - same reasons) Difficulty starting or continuing movement: Brain but the eyes can also be involved to assist the way out of the freeze.