Though the notion of swimming in cold water to fix a headache is hardly revolutionary. In the same way an ice pack works to bring down swelling, submersion in cold water causes the vascular system to contract. And since excessive blood flow to the brain is a major contributor to migraines, lowering your body temperature just makes sense. And the exertion of swimming upstream opens the adrenal glands and creates endorphins, which in turn reduces the perception of pain. If taken to the point of exhaustion, a chemical reset can occur. And just like with a computer, sometimes a reboot is all a
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