If you take a visit to the lense below it tells you about a report that will tell you if your keywords or phrases suck and it will also tell you if there is any paying traffic for your keywords. Because keywords are high priced it does not mean that you will get any traffic to pay you this high price. I don't want this to sound like a sales spiel but you may wish to take a look and see for yourself. In your circumstances it may pay you to invest in it as it is on special offer Just click on The Lense link in my sig hth
Medical info offered there is wrong. Get a good occupational medicine book! or better yet hire an occupational physician to write some articles for you [keyword cleverly inserted without anyone noticing]. Like me for instance.