Describe the epidemiology.
Sex: ♂ > ♀ (3:1)
Peak incidence: 20–40 years
Prevalence: rare, ∼ 0.1% of general population
Describe one risk factor and triggers.
Risk factor: tobacco use
Triggers of cluster headache
Alcohol
Histamine
Seasonal fluctuations
Nitroglycerine
Volatile substances (solvents, oil-based paint)
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