A primary headache is one that is not caused by another disease or medical condition, while a secondary headache is a symptom resulting from another disease or medical condition. Primary headaches account for more than 90 percent of all clinically significant headaches. There are three main types of primary headaches. These are tension-type headaches, migraines, and cluster headaches. Tension-type headaches are the most common, while cluster headaches are somewhat rare.
Few people experience all three types of headaches.
Secondary headaches may be caused by a variety of illnesses, including sinusitis, high blood pressure, and tumors. Usually, however, headaches do not indicate a serious underlying medical condition. Inc. All Rights Reserved.