Emotional triggers:
stress
anxiety
tension
shock
depression
excitement
Physical triggers:
tiredness
poor quality sleep
shift work
poor posture
neck or shoulder tension
jet lag
low blood sugar (hypoglycaemia)
strenuous exercise, if you are not used to it
Dietary triggers:
missed, delayed or irregular meals
dehydration
alcohol
the food additive tyramine
caffeine products, such as tea and coffee
specific foods such as chocolate, citrus fruit and cheese
Environmental triggers:
bright lights
flickering screens, such as a television or computer screen
smoking (or smoky rooms)
loud noises
changes in climate, such as changes in humidity or very cold temperatures
strong smells
a stuffy atmosphere