Causes of headaches
Headaches are one of the most
common in the world and there are so many kinds of headaches and there is a lot
of causes that makes the headaches happen.
First, changes in blood flow because substances that affect blood flow,
such as alcohol. Also, a tight muscle in
your shoulders, neck, and jaw makes the headaches happen. Finally, doctors think that a change in brain
chemicals also may cause a headache.
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