“A migraine is not easy to define, but there is the basic definition, which changes every few years. American Headache Society and International Headache Society has defined that for us and you’ll hear different ways it’s defined and sometimes that’s even confusing for patients. A migraine with aura, migraine without aura, a typical migraine, or even hemiplegic migraine – all these different topics and it just kind of defines as to what are the associated symptoms, or the things that go along with the migraine. But the defining thing is pain. It doesn’t have to be one sided or both sided. We used to kind of believe that – it can be both or one sided. We define that as typically throbbing type of pain or a pulsating type of pain. It has to be fairly disabling. It’s not what people would call a low-grade pain, it has to be fairly disabling where you don’t feel like you can really go on with your day.