| Diet | | Alcohol | | Chocolate | | Aged cheeses | | Monosodium glutamate | | Aspartame | | Caffeine | | Nuts | | Nitrites, nitrates | | Hormones | | Menses | | Ovulation | | Hormone replacement (progesterone) | | Sensory stimuli | | Strong light | | Flickering lights | | Odors | | Sounds, noise | | | Stress | | Let-down periods | | Times of intense activity | | Loss or change (death, separation, divorce, job change) | | Moving | | Crisis | | Changes of environment or habits | | Weather | | Travel (crossing time zones) | | Seasons | | Altitude | | Schedule changes | | Sleeping patterns | | Dieting | | Skipping meals | | Irregular physical activity | |
