CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Cluster headache. Artwork of a man holding his head in pain. The glowing lines represent severe localised headaches known as cluster headaches. These generally manifest on one side of the head only. The pain can be greater than that experienced in migraines. It is thought that the pain is caused by dilated blood vessels pressing on nerves.
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