What, if any, are the main factots that can bring on a migrane?

There are lots!: These vary greatly from person to person. Typical triggers include stress, menstrual periods, lack of sleep (or too much sleep), strong scents, certain foods, etc. Keeping a migraine journal and noting different things that might have caused your migraine can be very effective!

Many: This question has been answered before, but food items, fatigue, lack of sleep , prolonged fasting and environmental factors are some of the causes.