Candida Yeast:

Candida is a genus of yeasts (the most important being Candida albicans) that can cause fungal infections (candidiasis) in humans and other animals. Candida grows in the medical laboratory as large, round, white or cream (albicans meaning 'whitish') colonies on agar plates. Candida is a fungus often present in the human body. It only causes problems when there's too much of it. Then infections can occur not only in the [censored] but in other parts of the body as well--and in both sexes. Though there are four different types of Candida that can cause these infections, nearly 80 percent are caused by a variety called Candida albicans.
Causes of Candida:

The biggest cause of Candida infections is lowered immunity. This can happen when you get run down from doing too much and not getting enough rest. Or it can happen as a result of illness. Though not usual, repeated yeast infections, especially if they don't clear up with proper treatment, may sometimes be the first sign that a woman is infected with HIV, the virus that causes AIDS. Repeated yeast infections can also be caused by other, less serious, illnesses or physical and mental stress. Other causes include:
1.Use of antibiotics and some other medications, including birth control pills
2.Significant change in the diet
3.Poor nutrition
4.Diabetes
5.Pregnancy

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