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. How Are Vaginal Yeast Infections Treated? If you do have a yeast infection, your doctor will probably prescribe a pill to swallow or a cream, tablet, or suppository to put in the vagina. When you get home, follow all the directions on the package carefully. Creams, tablets, and suppositories often come with an applicator to help you place the medicine inside your vagina, where it can begin to work. If you're using a vaginal treatment and are sexually active, you should not have sex until the infection has been completely treated because these medicines can weaken condoms and diaphragms. All of these types of medicine can clear up your symptoms in a couple of days and cure the infection within a week. It's important that you take the medicine for the whole time that your doctor prescribes. If you stop taking it too soon, the infection could come back. If you're not feeling better within a few days of finishing treatment, call your doctor. Some of the medicines used to treat yeast infections are available without a prescription, but you shouldn't just buy one if you think you have a yeast infection. It's important to see a doctor for your diagnosis because if you actually have another type of infection, it could get worse if not properly treated. Also, over-the-counter medicine should not be used by anyone younger than 12 or girls who might be pregnant without talking to a doctor first. Do Guys Get Yeast Infections? Guys can get an infection of the head of the penis that is caused by the same Candida that 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. Back to Articles Related Articles Can You Get a Yeast Infection From Having Sex? Find out what the experts have to say. Read More Vaginal Discharge: What's Normal, What's Not Normal vaginal discharge has several purposes: cleaning and moistening the vagina and helping to prevent infections. But sometimes discharge indicates there's a problem. Get the facts on what's normal and what's not. Read More Urinary Tract Infections A urinary tract infection (UTI) is one of the most common reasons that teens visit a doctor. Learn about the symptoms of UTIs, how they're treated, and more in this article. Read More STDs (Sexually Transmitted Diseases) You've probably heard lots of discouraging news about sexually transmitted diseases. The good news is that STDs can be prevented. Find out how to protect yourself. Read More Gyn Checkups Girls should get their first gynecological checkup between ages 13 and 15. Find out what happens during a yearly gyn visit -- and why most girls don't get internal exams. Read More I've Never Had My Period, So What's This Discharge? Find out what the experts have to say. Read More How Can I Tell If I Have a Yeast Infection? Find out what the experts have to say. Read More Why Has My Discharge Changed? Find out what the experts have to say. Read More Feeling Fresh Wondering what you can do to feel as clean as possible "down there"? Read this article for the facts on douches, wipes, and other feminine hygiene products. Read More Bacterial Vaginosis BV is the most common vaginal infection. Although it's a mild infection, it can cause serious problems if it's not treated. Find out how to recognize BV and what to do about it in this article for teens. Read More Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.