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. 2016 Oct 11;56(10):1659–1663. doi: 10.1111/head.12963

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© 2016 The Authors Headache published by Wiley Periodicals, Inc. on behalf of American Headache Society

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Reported exacerbation of migraines by investigations. Proportions of subjects reporting investigations exacerbated migraines, either starting or worsening a migraine. White bars: tests without injections, black bars, tests with injections, and stippled bar, venipuncture for blood tests. Mean and standard error of the mean displayed. Tests that never provoked migraines (pulse oximetry, x‐rays) are not displayed. The P values were calculated by Dunn's multiple comparison test after performing the Kruskal Wallis test across all 9 groups (overall P value < .0001).