A headache is an ache originating in the frontal lobes of the brain. Headaches may be caused by many things, including stress, noise, and cranial pressure. They can also be caused by both hypertension and hypotension.
Headaches generally occur when the blood vessels in the brain expand to much. Because of this, medicines which constrict blood vessels, such as nicotine and caffeine, are sometimes used to treat headaches, however if they are used excessively they can also exacerbate them.
- Scientists have yet to completely unravel the cause or causes of headaches. It was once believed that constriction and dilation of blood vessels caused migraine headache, while muscle contraction caused tension headache. The constriction of vessels in the head was thought to cause the aura of migraine, as well as the nausea and vomiting. The subsequent relaxing, or dilation, of the vessels then brought on the pounding pain associated with migraine.