Characterized by cyclical patterns of unilateral pain known as clusters, cluster headaches are intense. These types of headaches wake people up in the middle of the night for anywhere between one and three hours on average. According to the Migraine Trust, pain can not only be localized around one eye, which switches sides from time to time but also around the temple or forehead. Approximately 80 percent of cluster headaches are episodic, reaching peak intensity within the first five to 10 minutes. They typically occur once a year in Spring or Autumn. The remaining 20 percent are chronic and don’t leave room for any pain-free intervals. Triggers include strong smells, such as perfume or gas as well as becoming overheated.
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