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| Trigger factor | No (%) of patients |
|---|---|
| Stress, annoyance | 44 (40) |
| Alcohol, wine | 34 (31) |
| Weather, ambient temperature | 32 (29) |
| Fatigue | 30 (27) |
| Effort, physical activity | 19 (17) |
| Tobacco | 18 (16) |
| Rest, weekend, holidays | 16 (14) |
| Smells | 15 (14) |
| Food, meals | 11 (10) |
| Altitudes, flight | 10 (9) |
| Menses | 3 (3) |
Total number of patients = 111 (no response: two patients).
