Why don't ads display on some pages?

I am generally pleased with the performance of Adsense on my site.
However, there are some pages where no ads show up despite there being
plenty of content for ad placement. As an example, look at the following
pages: www.medfriendly.com/quadriplegia.html
www.medfriendly.com/hypoxicischemicencephalopathy.html
www.medfriendly.com/feces.html
www.medfriendly.com/rabies.html

I have other pages about spinal conditions and so the quadriplegia page
should display similar ads.

There are three spots for ads on these pages: on the top, bottom, and
embedded in test. All are typically blank. I have tried moving the ads
around the page but it does not help. This is a HUGE problem for the feces
page as it is by far, the most viewed page on my site. How can we solve
this problem? I contacted all google and the best they can say is "Sorry, but that happens some times." Ummmmmm. There has to be some kind of solution. Anything anyone can see that I am doing wrong?

Thanks

One way is to first make sure you copied the code correctly. If you did and you have pleanty of content give it time. As i was havign problem with one of my pages and kept moving the ads aroudn to see if that would work and it didnt help so i finnally just left it all lone for about 1 week then Bam ads started showing up.......

Pages with "sensitive" content will not display ads. "Sensitive" means anything Google deems might reflect poorly on advertisers. Since they don't review the page they just apply a filter. If you have the magic words on the page the filter gets triggered.

You can send a report to Google and list those pages but they may just decide the filter was correct in banning the pages from adsense.