Cluster headaches are rare and cause severe pain that tends to recur in the same way each time. Cluster headaches occur in groups, or clusters, and each attack lasts about 1 to 3 hours on average.
Cluster headaches -- called cluster because of their pattern of striking in groups or clusters -- hit at the same time of day for a period of weeks or months, then vanish as suddenly and as mysteriously as they appeared.
Tension headaches are the most common type of headache. Stress and muscle tension are often factors in tension type headaches.