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A headache literally means ‘pain in the head’. In many cases, it does not stop with the head and may extend on to the neck and upper back. It is a very common complaint that may occur frequently in some people.
The brain is itself pain-free as it lacks nociceptors;however, the surrounding membrane,dura, and the associated blood vessels have pain receptors and are highly prone to pain. Any irritation to these membranes and blood vessels result in aches. Irritations to the head muscles too can result in a painful experience.
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