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Reviva Brain Different types of nociceptors are activated by pressure, damage, extremes of temperature and some chemicals, such as capsaicin (the active ingredient in chilli peppers). Brain freeze” or “ice-cream headaches” seem to be caused by sudden changes in blood flow in the veins that lie between the back of the throat and the brain. Dehydration causes headaches by irritating the blood vessels in the head and is one reason for the throbbing head that many experience after a night of drinking. And any dentist can tell you that a headache could indicate you over-exert your jaw, perhaps by grinding your teeth when you sleep. https://medium.com/@ericbrown0159/reviva-brain-supplement-review-upgrade-brain-powers-56757bc4ae69