Most people get headaches from time to time, but not everyone is familiar with the many different types of headaches that can occur. Ninety percent of headaches are considered primary, including tension headaches, migraines, and cluster headaches. Secondary headaches are triggered by an underlying problem, such as sinusitis. Traction headaches or inflammatory headaches are caused by a medical condition. And it may surprise you to learn that not everyone gets headaches. In fact, the National Institute of Neurological Disorders and Stroke says that about 10 percent of all men and 5 percent of women have never experienced a headache.
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