- Routine changes
- Stress
- Sleep
- Caffeine
- Hormone changes (women)
- Environment
- Computer screens
- Particular foods
- Lack of food
- Additives
- Alcohol
- Cheese
- Dehydration
- Drugs
- Exercise
- Oral contraceptives
- Grinding teeth
Taken from Independent Nurse 5/9/2011 p37
Taken from Independent Nurse 5/9/2011 p37