Science1980s-2020sglobalhigh confidence

People with cluster headache were found to have higher cortisol and lower melatonin levels compared to individuals without headache disorders.

Notes on verification

Confirmed by multiple independent peer-reviewed studies (Chazot 1984, Leone 1995, Waldenlind et al.) and a 2023 systematic review/meta-analysis in Neurology, though some individual studies show conflicting details. [tier=gold indep_score=0.925 clusters=4 claim_tier=notable]

Sources