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Cluster headaches are very painful. They happen on one side of the head and come in clusters, or cycles (also called cluster periods). A cluster period might last 1 month or longer.

Migraines are painful, throbbing headaches that often start on one side of the head. The pain may move from one side of your head to the other, or you may feel it on both sides at the same time.

Migraines are painful, throbbing headaches that often start on one side of the head. The pain may move from one side of your head to the other, or you may feel it on both sides at the same time.