Overall, I think the article is very informational and well-organized. The intro is straightforward, simple, and a good introduction to the topic. I also like the way the classification is written out. I just have a few suggestions that I hope will be helpful.
Under the "primary headaches", it might be nice to define what makes a headache a primary headache (I think a good definition was provided under the "Classification-NIH" subsection and read: "...primary headaches are those that do not show organic or structural etiology").
Overall, the causes section is well laid out and easy to read.
In the "pathophysiology" section, might be nice to provide a link to or define "nociceptors" in the first paragraph. Also, I'm not sure that the last paragraph in this section is so helpful, as it seems lacking in details the way it is. However, I do not have any specific suggestions as to how to change it.
In the "imaging" subsection under "diagnosis", I am wondering if MRI should be discussed at all. My headache knowledge isn't what it should be, but it seems like MRI might be another type of imaging that warrants discussion in its relation to diagnosing severe or new-onset headaches.
The treatment section looks like it could use some reorganization (maybe start with the most common therapies) as well as some discussion on common abortive treatments.
The epidemiology section is great.
As I mentioned earlier, I really like the article and I think just a few tweaks would make it that much better. Good work! — Preceding unsigned comment added by CmcUCSF2014 (talk • contribs) 15:51, 21 April 2014 (UTC)
As written the epidemiology in adults directly contradicts the epidemiology in children. "Approximately 64–77% of people have a headache at some point in their lives." Whereas the children section report that 90% of children have had a headache by age 18. — Preceding unsigned comment added by 220.127.116.11 (talk • contribs)
The statistics were based on a single country's experience. I have removed this as it cannot necessarily be generalised to other populations.