In recent years, I believe Doctors and Dentists have become more accepting of the fact that some people genuinely DO feel pain at higher levels than others.  Not so in the past!  I recall only too clearly the impatience of various health professionals who were not willing to consider the fact that I needed almost 3 times the usual level of anesthetic to be rendered  painless. Even so, I was partly conscious during one operation - not a pleasant sensation, i can assure you!

So for me it is doubly interesting to come across this recent research from Massachusetts General Hospital in Boston, which shows definite changes in the brain of people who have migraines - as I did for many years - changes which result in a greater sensistivity to pain, and to noise (count me in on that one, too) . 

Brain Differences Found In People With Migraine