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.
âA brain freeze is caused when something very cold, like ice cream, touches the top palate in your mouth. The blood vessels constrict due to the cold. As the palate warms, the blood vessels suddenly enlarge and the blood rushes back to the blood vessels.ouâre with a group of friends eating the dessert, and suddenly you have a severe headache that lasts for a brief amount of time. Youâre not alone because billions of individuals have endured this common reaction called sphenopalatine ganglioneuralgia. Itâs also known as brain freeze or ice cream evoked headache.