PHILADELPHIA (CBS) - Yeast infections can be irritating and frustrating to deal with for many women, some of whom are more prone to repeat infections.

We know there are certain things that can increase the likelihood of a yeast infection such as being placed on antibiotics or having high blood sugar, but we are also recognizing that the cause of the majority of common yeast infections, candida albicans, is starting to become resistant to the treatments that we have available.

One of the most commonly prescribed medications since 1990 is fluconazole and although it is still 90% effective, that drop in effectiveness is causing concern.

Another problem is that a growing percentage of yeast infections are being caused by a strain of candida called candida glabrata rather than candida albicans. It may sound technical but for those who have chronic yeast infections it is far more than just a theoretical issue.

Reported By Dr. Brian McDonough, KYW Newsradio Medical Editor