Many women, a least once in their lifetime, have experienced a yeast infection. They can be very uncomfortable and sometimes hard to treat. A recent recommendation has been to put yogurt in the vagina to ward off or treat the infection. I have not seen any data that would back this theory, but I have a few thoughts about it.
The vagina is like a self-cleaning oven. Many yogurts contain acidophilus, which may help but could also make the situation worse. Some yogurts also contain a lot of sugar and other ingredients that might make the infection worse. We have seen a resurgence of different species of yeast including tropicalis and galbrata, which normal over-the-counter medications often do not cover. The wetness that the yogurt creates may also lead to irritation on the vulva.
Until we know better, let's stick to the tried and true – see your physician and get examined.