Headaches are a common medical condition that affect hundreds of millions of people around the world each year. There are many different types of headaches, each with its own unique characteristics that make it distinct from other types. - Tension Headache — The most common type of headache is called a tension headache, which is caused by the tightening of the muscles in the neck and shoulders. - Migraine Headache — Another type of headache is a migraine, which is characterized by a throbbing pain in one side of the head and is often accompanied by nausea and light sensitivity. - Hypnic Headache — This rare type of headache affects people between the ages of 40 and 80 and occurs exclusively at night, hence its name. - Cluster Headache — Cluster headaches are intense, short-lived bursts of pain, typically lasting only 5 minutes to two hours. They can occur several times a day for a period of days or weeks, then go away for weeks or months only to return later.