When it comes to a migraine, an ounce of prevention is worth a pound of cure. Once you identify the things that cause your headaches — known as migraine triggers — you can dramatically reduce the frequency of your migraine episodes. Triggers can include a wide range of environmental factors, including certain foods, beverages, chemicals, medications, and even changes in altitude. While some triggers, such as weather, may be out of your control, many can be avoided with careful planning and lifestyle changes.