What Are Vaginal Yeast Infections?

Yeast infections (also known as candidiasis) are common infections caused by Candida albicans yeast, which is a type of fungus. Yeast infections usually happen in warm, moist parts of the body, such as the mouth, and moist areas of skin.
A yeast infection in the vagina is known as vulvovaginal candidiasis (pronounced: can-dih-DYE-uh-sis). Vaginal yeast infections are common among teen girls, and about 75% of all females will have one at some point.

What Are the Signs and Symptoms of Vaginal Yeast Infections?

Vaginal yeast infections can cause:
  • itching and irritation in the vagina
  • redness, swelling, or itching of the vulva (the folds of skin outside the vagina)
  • a thick, white discharge that can look like cottage cheese and is usually odorless, although it might smell like bread or yeast
  • pain or burning when urinating (peeing) or during sex
If you have any of these symptoms, see your doctor or gynecologist. It's easy to confuse the symptoms of a yeast infection with those of some STDs and other vaginal infections. Your doctor can give you the right diagnosis so that you can be treated appropriately.
If you have a vaginal yeast infection, your doctor can prescribe treatment to clear up the symptoms in a couple of days and cure the infection within a week.

What Causes Vaginal Yeast Infections?

Having small amounts of Candida on the skin and inside the mouth, digestive tract, and vagina is normal. A healthy immune system and some "good" bacteria keep the amount in a person's body under control.
But yeast in the vagina can sometimes "overgrow" and lead to symptoms of a yeast infection. Stress, pregnancy, and illnesses that affect the immune system may allow yeast to multiply. So can certain medicines, including some birth control pills and steroids. If you're taking antibiotics, such as for strep throat, the antibiotics can kill the "good" bacteria that normally keep the Candida in check. Yeast also can grow a lot if a girl's blood sugar is high. Girls who have diabetes that isn't controlled are more likely to get yeast infections.
Many girls find that yeast infections tend to show up right before they get their periods because of the hormonal changes that come with the menstrual cycle. Clothing (especially underwear) that's tight or made of materials like nylon that trap heat and moisture might make yeast infections more likely. Using scented sanitary products and douching can upset the healthy balance of bacteria in the vagina and make yeast infections more likely.
Yeast infections can happen to any girl. They're not considered sexually transmitted infections. Although yeast infections may spread from one sexual partner to the other, it's rare. The partner of someone who has a yeast infection does not automatically have to be treated unless symptoms appear.

How Are Vaginal Yeast Infections Diagnosed?

Treating a yeast infection is simple, but it's important to visit your doctor for the right diagnosis, because other infections can cause similar symptoms but require different treatments.
At the visit, your doctor might take a urine sample (to rule out a urinary tract infection) and swab some discharge from your vagina to examine under a microscope.

Do Guys Get Yeast Infections?

Guys can get an infection of the head of the penis that is caused by the same Candidathat causes vaginal infections in girls. Guys who have diabetes or are on antibiotics for a long time are more prone to this infection. A guy with a yeast infection may not have any symptoms or the tip of the penis may become red and sore or itchy. Some guys might have a slight discharge or pain with urination as well.
Guys who are not circumcised need to take extra care to clean properly beneath their foreskins. The warm, moist folds of the foreskin are the perfect environment for yeast to thrive. Keeping the area clean and dry may help prevent an infection, but if symptoms do show up, a doctor can treat the infection.

Can Vaginal Yeast Infections Be Prevented?

For most girls, there's no way to prevent yeast infections. You may feel more comfortable if you wear breathable cotton underwear and clothes and avoid vaginal sprays and douches. But there's no scientific proof that this will prevent yeast infections.
If you have diabetes, keeping blood sugar levels stable is a way to avoid yeast infections.
If you think you have an infection, call your doctor for advice. Don't take leftover antibiotics or someone else's antibiotics or medicine. They might be the wrong choice for your condition, and taking antibiotics when they're not needed can make yeast infections more likely.
Yeast infections can be annoying, especially if they happen regularly. To help avoid them, follow your doctor's advice, wear cotton underwear, and try to wear loose-fitting clothes. Your body will thank you.

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