The beast known as yeast. It is a common problem for many women. When left unchecked in the body, yeast can turn into an unpleasant fungal infection that causes vaginal discharge and irritation (not to mention intense itching). Over-the-counter medications and prescription medications for yeast infections are designed to treat the infection but come with their own unpleasant side effects. Probiotics are ideal for helping to prevent nasty yeast infections from even getting started.