Headaches are fairly common and are caused by tight, contracted muscles in your shoulders, neck, scalp, and jaw. These are called tension headaches. They are often related to stress, anxiety, overworking, not getting enough sleep, and missing meals. Some headaches can be triggered by chocolate, cheese, and monosodium glutamate (MSG). People who drink caffeine can have headaches when they don't get their usual daily amount, these are referred to as "caffeine withdrawal" headaches.
Other common causes of headaches include:
Holding your head in one position for a long time, like at a computer, microscope, or typewriter
Poor sleep position
Overexerting yourself
Clenching or grinding your teeth
Source: http://www.nlm.nih.gov/medlineplus/ency/article/003024.htm
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