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 freeze is characterized by intense, stabbing pains in your forehead that peak between 30-60 seconds after the introduction of the cold stimulus. Brain freeze will subside on its own after a few minutes (no longer than five). The mechanism that causes brain freeze has also been linked to migraines. If your headache doesnât go away after 5-10 minutes, or if you get brain-freeze-type pains without consuming cold things, consider seeking medical treatment.