Cluster headache is a relatively rare but extremely painful type of headache, usually strictly one- sided, attacks in cyclical pattern and bouts (1). It occurs in about one in 1000 people, often starts in 20-40 years of age. Males are about three times more likely to be affected than females (2). It occurs rarely in children and is extremely …
https://headacheaustralia.org.au/headachetypes/cluster-headache/

