The History and Nature of Cluster Headaches

Source: Chapter 1 (history and nature), sections 1–2. Section numbering retained from the source chapter.

The story begins with three centuries of physicians describing the same condition under different names — and with what the condition actually is, and what it feels like from the inside.

Compiled as a personal reference document. Every claim below carries an evidence tag: peer-reviewed, preprint / trial, citizen science, community report, or historical. Community reports are never discarded for being anecdotal — they are labelled honestly and included because patterns in anecdote are data. Where sources conflict, the conflict is presented explicitly rather than smoothed over. “Unknown” and “contested” are treated as valid, final answers where that is what the evidence supports.