Headaches have numerous causes, and in 2007 the International Headache Society agreed upon an updated classification system for headache. Because so many people suffer from headaches, and because treatment is sometimes difficult, the new classification system allows health care practitioners to understand a specific diagnosis more completely to provide better and more effective treatment regimens.
There are three major categories of headaches:
1. primary headaches,
2. secondary headaches, and
3. cranial neuralgias, facial pain, and other headaches