There are several different kinds of headaches. The most common type of headache is the tension headache.
The exact cause of these types of headaches is unknown, but there are several factors that have been shown in many cases to cause or at least play a part in tension headaches. This includes things like caffeine withdrawal, eye strain, and stress. Other things like teeth clenching, which results in muscle tension, and other strains on the muscles, has been also been shown to play a part in these types of headaches.
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