Title: Yeast infection (vaginal) - Symptoms and causes - Mayo Clinic
Headings: Yeast infection (vaginal)
Yeast infection (vaginal)
Overview
Products & Services
Symptoms
Complicated yeast infection
When to see a doctor
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Causes
Risk factors
Prevention
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Yeast infection (vaginal)

Content: Itching and irritation in the vagina and vulva
A burning sensation, especially during intercourse or while urinating
Redness and swelling of the vulva
Vaginal pain and soreness
Vaginal rash
Thick, white, odor-free vaginal discharge with a cottage cheese appearance
Watery vaginal discharge
Complicated yeast infection
You might have a complicated yeast infection if: You have severe signs and symptoms, such as extensive redness, swelling and itching that leads to tears, cracks or sores
You have four or more yeast infections in a year
Your infection is caused by a less typical type of fungus
You're pregnant
You have uncontrolled diabetes
Your immune system is weakened because of certain medications or conditions such as HIV infection
When to see a doctor
Make an appointment with your doctor if: This is the first time you've had yeast infection symptoms
You're not sure whether you have a yeast infection
Your symptoms aren't relieved after treating with over-the-counter antifungal vaginal creams or suppositories
You develop other symptoms
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Causes
The fungus candida albicans is responsible for most vaginal yeast infections. Your vagina naturally contains a balanced mix of yeast, including candida, and bacteria. Certain bacteria (lactobacillus) act to prevent an overgrowth of yeast. But that balance can be disrupted. An overgrowth of candida or penetration of the fungus into deeper vaginal cell layers causes the signs and symptoms of a yeast infection. Overgrowth of yeast can result from: Antibiotic use, which causes an imbalance in natural vaginal flora
Pregnancy
Uncontrolled diabetes
An impaired immune system
Taking oral contraceptives or hormone therapy that increase estrogen levels
Candida albicans is the most common type of fungus to cause yeast infections. Yeast infections caused by other types of candida fungus can be more difficult to treat, and generally need more-aggressive therapies.