If your on immunosupressive drugs, that can make it easier to get a yeast infection. Yeast is a fungus scientifically referred to as Candida. The specific type of fungus most commonly responsible for vaginitis is Candida albicans. Yeast is commonly present on normal human skin and in areas of moisture, such as the mouth and vagina. In fact, it is estimated that between 20%-50% of healthy women normally carry yeast in the vaginal area. Vaginitis is inflammation of the vagina. Vaginitis is very common and is reported by as many as 75% of women at some point in their lives. Vaginitis can be caused by a number of infections, including bacteria (such as Gardnerella and gonorrhea), protozoans (such as trichomonas), and yeast (Candida). Vaginal yeast infection, which is the most common form of vaginitis, is often referred to as vaginal Candidiasis. The causes of yeast infections of the mouth include being a baby or being immunosuppressed. Babies get them often before their immune systems learn to fight off the Candida species. The mouth usually looks like there are white plaques on a red base that covers the tongue, lips and the buccal mucosa. It is best treated with nystatin suspension that is squirted into the mouth. The baby's bottle nipples and pacifiers and some toys need to be washed so as to avoid getting the infection back again. Intestinal yeast infections occur when someone takes antibiotics or when they are diabetic or immunosuppressed. The infection occurs primarily in the colon where normal healthy bacteria are wiped out for a variety of reasons. Yeast, which is usually present in small numbers, is overgrown then and an infection ensues. The individual becomes ill with either diarrhea or constipation, cramping pain in the colon, bloating and dyspepsia. The yeast causes the lining of the colon to become leaky and to leak food particles and Candida into the blood stream causing symptoms of food allergies, joint pains, body aches and extreme fatigue. It is hard to diagnose this condition unless one is suspicious of it. The treatment involves taking antifungal agents or using probiotics, a natural product that replaces the yeast with healthy bacteria. It is also true that diabetics are a bit immunosuppressed. Other causes of immunosuppression include having HIV or a congenital cause of the condition.