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.
This nerve also senses facial pain, so as the neural signals are conducted the brain interprets the pain as coming from the foreheadâthe same referred pain phenomenon seen in heart attacks. Brain-freeze pain may last from a few seconds to a few minutes. Research suggests that the same vascular mechanism and nerve implicated in brain freeze cause the aura (sensory disturbance) and pulsatile (throbbing pain) phases of migraines.