| Stress and/or tension |
| Hormonal changes: menstrual cycles, |
| Pregnancy, oral contraceptives |
| Fatigue |
| Missing a meal (causes low blood sugar) |
| Alcohol intake |
| Certain foods: chocolate, cheeses, yogurt, nuts, MSG, nitrates and nitrites (hot dogs, bacon, sausage, lunch meats) and caffeine |
| Glaring or flickering lights |
| Weather changes |
| Family history of migraines |
| Smoking |