Migraines: Causes and triggers Migraines are headaches that cause severe, throbbing pain, along with nausea, vomiting, and sensitivity to light or sound. Migraine headaches usually last for between four (4) and seventy-two (72) hours. Many people experience symptoms, called " auras ," before their migraine starts that signal one is coming on. What causes a migraine? Though tests are inconclusive most researchers believe that migraines are due to an imbalance of hormones and chemicals produced in the brain. When the levels of these hormones or chemicals increase they lead to inflammation. This inflammation then causes the blood vessels in the brain to swell and press on nearby nerves, causing pain . Persons with migraines can usually tell when when an attack is coming on and can identify what is called triggers that cause migraine pain.
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