Severe headache. Artwork of a man holding his head in pain. The glowing red area represents severe localised headaches such as cluster headaches, and can also represent migraines. Cluster headaches 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. Migraines also affect one side of the head, and cause pulsating and extreme pain lasting hours to days.
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