Figure 4. Most Common Trigger Factors for Cluster Headache Attacks During a Bout for Study Participants Reporting Specific Triggers (Free-Text Answers).

Four hundred forty-six participants with cluster headache (283 male/163 female) reported yes to specific trigger factors. *Significant differences between male and female participants who report trigger factors were found for alcohol (p = 0.001), stress/worry (p = 0.0001), weather/temperature/wind (p = 0.0003), food/drink (p = 0.040), and sleep deprivation/fatigue (p = 0.037).