Question

why we feel headache

Answer 1

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HERE'S YOUR ANSWER!

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Almost everyone gets headaches. A lot of the time, they're caused by something simple — such as staying up too late, running around in the sun too long, or the stress of a big exam. Some people get headaches that come often or last for a long time.

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Answer 2

Primary headaches are stand-alone illnesses caused directly by the overactivity of, or problems with, structures in the head that are pain-sensitive. This includes the blood vessels, muscles, and nerves of the head and neck. ... Common primary headachesinclude migraines, clusterheadaches, and tensionheadaches.