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Headaches are comprised of two major categories, primary and secondary. Headaches belonging to the primary group are not caused by underlying medical conditions while secondary headaches are the result of a medical condition such as trauma, infection or possibly even a brain tumor. Most headaches belong in the primary category.
The primary category headaches [...]

There are 3 common kinds of headaches.
1. Sick Headache. This type of headache occurs if undigested food stays in the stomach, during times of increased stress, if there is a disordered liver, or when there is mental or physical overwork. In women, disorders of menstruation may cause a sick headache.
Treatment
Drink a [...]