Why the adsense showing unrelated ads?

Hi everyone,

I need some help here. I've just created a website called symptoms of cancer.

I put adsense ad at one of the site, kidney cancer symptoms. But it shows unrelated ads. How can I fix it?

Thanks.
Khairi

p.s. The homepage and mouth cancer symptoms is showing related ads but this kidney cancer symptoms site doesn't show the cancer ads. Why?

 

Do you have any keywords?

 

Yeah, I put <meta name="keywords" content="symptoms of cancer, cancer symptoms, kidney cancer, kidney cancer symptoms" /> for the kidney cancer symptoms site but the adsense show irrelevant ads.

 

the page keywords density ,
use google toolbar then use Highlight Pin to see the keywords denisty, then u will know what is the most keywords in your site other than cancer term

 

"But it shows unrelated ads. How can I fix it?"

In order to get relevant ads, you need to do Section Targeting.

 

I've put the code below before </body>.
However it is still showing irrelevant ads

<!– google_ad_section_start –>
Kidney Cancer Symptoms
<!– google_ad_section_end –>

Where should I put this code?

 

from my experience, keywords in url is the biggest impact to what ads will showing

sometimes my page not showing completely but the adsense in the top have been showing