I mentioned here before that cluster headache is a rare disease. About 1 in 1.000 people suffer from it. Of this group about 1 in 10 is chronic. I sometimes hear the remark that this doesn’t seem rare at all. That’s the reason I made this blog post and because an image speaks louder than 1.000 words I made a graphic to illustrate the rarity of cluster headaches. The first one represents episodic cluster headaches and the second one illustrates chronic cluster headaches. The people with episodic cluster headache are marked in orange, while the one person with chronic cluster headaches is marked in yellow. Have fun scrolling!