All over the world, people are particularly sensitive about illnesses of the most intimate nature - that of the reproductive organs. While there are many such problems, one of the most common is yeast infection in women. A yeast infection is basically when yeast - more specifically a type of fungus - called Candida albicans is able to penetrate and proliferate in mucous membranes of the body, which include the mouth and genital regions. Another colloquial term for this is thrush, specifically vaginal thrush.