A vaginal yeast infection is caused by an overgrowth of yeast organisms that normally live in small numbers in the vagina. Using antibiotics. Having high estrogen levels (hyperestrogenemia), such as during pregnancy, hormone therapy (HT or ET) use, high-dose birth control pill use, and the menstrual cycle.
http://www.webmd.com/women/tc/vaginal-yeast-infections-cause
A vaginal yeast infection is not considered a sexually-transmitted infection (STD), but 12% to 15% of men develop symptoms such as itching and penile rash following sexual contact with an infected partner. Under normal circumstances, a vaginal yeast infection is not serious and can be treated with medications.
http://www.emedicinehealth.com/vaginal_yeast_infections/article_em.htm
A vaginal yeast infection is caused by an overgrowth of yeast organisms that normally live in small numbers in the vagina. Things that may encourage an excess growth of vaginal yeast include: Using antibiotics.
http://www.webmd.com/women/tc/vaginal-yeast-infections-cause
Most yeast infections involve Candida albicans (C. albicans), a yeast that can be treated effectively with standard yeast infection medicine. Recurrent vaginal yeast infections tend to involve non-C. albicans types of yeast, which are more resistant to the standard treatments for C. albicansyeast infections.
http://www.webmd.com/women/tc/vaginal-yeast-infections-cause
Most yeast infections are caused by a type of yeast called Candida albicans. A healthy vagina has many bacteria and a small number of yeast cells. The most common bacteria, Lactobacillus acidophilus, help keep other organisms-like the yeast-under control.
http://www.webmd.com/women/tc/vaginal-yeast-infections-topic-overview
Yeast infections affect different parts of the body in different ways: 1  Thrush is a yeast infection that causes white patches in your mouth. 2  Candida esophagitis is thrush that spreads to your esophagus, the tube that takes food from your mouth to your stomach. It can make it hard or painful to swallow.
https://medlineplus.gov/yeastinfections.html
Yeast is a fungus that normally lives in the vagina in small numbers. A vaginal yeast infection means that too many yeast cells are growing in the vagina . These infections are very common. Although they can bother you a lot, they are not usually serious.
http://www.webmd.com/women/tc/vaginal-yeast-infections-topic-overview
Thrush is a yeast infection that causes white patches in your mouth. Candida esophagitis is thrush that spreads to your esophagus, the tube that takes food from your mouth to your stomach. It can make it hard or painful to swallow. Women can get vaginal yeast infections, causing vaginitis.
https://medlineplus.gov/yeastinfections.html
When something happens to change the balance of these organisms, yeast can grow too much and cause symptoms. Taking antibiotics sometimes causes this imbalance. The high estrogen levels caused by pregnancy or hormone therapy can also cause it. So can certain health problems, like diabetes or HIV infection.
http://www.webmd.com/women/tc/vaginal-yeast-infections-topic-overview
Other causes of symptoms similar to those of a vaginal yeast infection include local irritation (for example, from intercourse or tampons); allergic reaction; or chemical irritation from soap, perfumes, deodorants, or powders.
http://www.emedicinehealth.com/vaginal_yeast_infections/article_em.htm
causes of vaginal yeast infection
A vaginal yeast infection is caused by an overgrowth of yeast organisms that normally live in small numbers in the vagina.   An overgrowth of yeast organism is a cause of vaginal yeast infection.