The following list is a shortened version of potential triggers. You may want to look up more on your own.
Foods and drinks can often be triggers for migraines, including caffeine, alcohol, salty, and processed foods. Mention that some people might have more specific food triggers.
Lifestyle changes like stress and depression can also lead to migraines for chronic migraine sufferers. Talk about this in more detail, including some simple ways to relieve stress.
This usually pertains to women, who might have more migraines during their menstrual cycles, and some women during pregnancy as well.
Lack of Sleep
Insomnia is a very common migraine trigger, so encourage more sleep.