What Is a Yeast Infection? Symptoms, Causes, Diagnosis, Treatment, and Prevention

Most women — and some men — will have a yeast infection at some point in their lives.

Medically Reviewed

A vaginal yeast infection is an infection resulting from the overgrowth of yeast — a type of fungus — of the genus Candida.

Also called candidal vaginitis, vaginal candidiasis, or vulvovaginal candidiasis, yeast infections are most commonly caused by Candida albicans.

It is easily treated with antifungal medication. If symptoms persist for more than a week, check with your doctor to rule out a more serious condition. (1,2)

Common Questions & Answers

What is a yeast infection?
Yeast lives naturally in the body and on the skin. When it grows out of control, it causes a yeast infection. Most common are vaginal yeast infections, which cause itchiness and discomfort. With treatment, most yeast infections clear up within a week.
What are the medical causes of a yeast infection?
Several conditions help a yeast infection develop. They include: pregnancy; certain types of medication, including some contraceptives (birth control pills, patches, vaginal rings, IUDs); antibiotics, and steroids; immune-suppressing diseases, including HIV; diabetes; obesity; and stress and lack of sleep, which can weaken the immune system.
What lifestyle habits can contribute to a yeast infection?

These habits may help yeast grow and lead to an infection:

  • Eating a diet high in sugar
  • Using scented soaps, bubble baths, and feminine sprays
  • Douching
  • Poor vaginal hygiene
  • Wearing clothing that keeps the vaginal area warm and moist, such as synthetic underwear, pajama bottoms, and tight jeans or spandex
How is a yeast infection treated?
Several drugs can be used to treat vaginal yeast infections, available either over the counter or by prescription. Medications include antifungal creams, ointments, suppositories, medicated tampons, or oral tablets. Talk to your doctor if this is a first yeast infection; symptoms may indicate other health issues and can require different treatment.

Signs and Symptoms of Yeast Infections

The most common symptoms of mild vaginal yeast infections include:

More severe infections can cause redness, swelling, and cracks in the skin outside the vagina (the vulva). (1,2,3,4)

Causes and Risk Factors of Yeast Infection

Fungi of the genus Candida normally live on the skin and inside the body (mouth, throat, gut, and vagina) without causing health problems. Research suggests about 20 percent of women have candida in the vagina that doesn't cause infection. (1)

There are many species of candida, at least 15 of which are known to cause infections if they multiply out of control. (5)

In the United States, around 90 percent of vaginal yeast infections are caused by the species C. albicans. Most other cases are caused by C. glabrata. Less frequently, C. parapsilosisC. tropicalis, and C. krusei cause vaginal yeast infections. (6,7)

Candida yeast cause an infection when something throws off the balance of microorganisms that live in and on your body, such as:

  • Pregnancy
  • Certain types of medication, including hormonal contraceptives (birth control pills, patches, or vaginal rings), antibiotics, and steroids
  • Immune-suppressing diseases, including HIV
  • Diabetes
  • Obesity
  • Stress and lack of sleep, which can weaken the immune system (2,3)

Additionally, certain lifestyle habits may also promote the growth of Candida, including:

  • Being sexually active (vaginal yeast infections are not considered a sexually transmitted infection but they are more common in women who are sexually active)
  • Eating a diet high in sugar (a yeast food source)
  • Douching
  • Other contraceptive use, including vaginal sponges, diaphragms, and intrauterine devices (IUDs)
  • Maintaining poor vaginal hygiene

Wearing clothing that keeps the vaginal area warm and moist, such as synthetic underwear, pajama bottoms, and tight jeans or spandex (3,8,9)

Diagnosis of a Yeast Infection

Though it may be tempting to self-diagnose a vaginal yeast infection, since effective over-the-counter (OTC) treatments exist, experts recommend you see a doctor.

Several other conditions — notably bacterial vaginosis (vaginal infection caused by bacteria), trichomoniasis (a sexually transmitted infection), and dermatitis (irritated skin) — can cause symptoms similar to yeast infections, making self-diagnosis difficult. In one study published in the journal Obstetrics & Gynecology, only about 34 percent of women who purchased OTC antifungal medications accurately diagnosed themselves with a yeast infection. (3)

You should especially see a doctor if:

  • This is your first yeast infection.
  • Medications for a previous yeast infection are not working on your current infection.
  • Your symptoms differ from previous yeast infections. (10)

To diagnose a yeast infection, your doctor will ask you about your symptoms and medical history, perform a pelvic exam, and take a sample of vaginal discharge. A lab technician will examine the discharge to determine if there is an overgrowth of candida.

Your doctor will make a diagnosis based on all the findings — a positive fungal culture alone does not mean you have a yeast infection, because women can have candida in their vagina without showing symptoms. (1,3)

Duration of Yeast Infection

Most yeast infections clear up within a few days, depending on the severity of the infection and the medication used.

But up to 8 percent of women develop recurrent or chronic yeast infections (at least four infections per year). These infections are typically due to non-albicans species, and may require different treatment. (3,7)

Treatment and Medication Options for a Yeast Infection

Vaginal yeast infections are treated with over-the-counter or prescription antifungal creams, ointments, tablets, suppositories, or oral medications. You will need to take the medication for 1 to 7 days, depending on which medication you are using.

Medications Options

OTC and prescription drugs that may be used include:

If you have recurrent yeast infections, you may require multiple doses of fluconazole in the first week of infection, followed by at least six months of maintenance therapy (periodic fluconazole doses depending on the presence of symptoms). (11,12)

Alternative and Complementary Therapies

Can home remedies and natural cures help treat and prevent vaginal yeast infections? Many women wonder what else they can do to deal with yeast problems. Despite the documented effectiveness of over-the-counter products and prescription medication for vaginal yeast infections, some women prefer to treat their ailments with natural or home remedies.

Home remedies for vaginal yeast infections include:

  • Probiotics (oral and intravaginal)
  • Boric acid (suppository gelatin capsules)
  • Vinegar (vaginal irrigation)
  • Povidone-iodine (topical solution, ointments, and vaginal suppositories)
  • Garlic pills
  • Tea tree oil (topical)
  • Propolis (vaginal cream)
  • Sodium bicarbonate (bath or vaginal irrigation)
  • Dietary changes to reduce sugar intake, including from dairy products (15)

While they are very popular, the effectiveness of home remedies for treating and preventing yeast infections is not very well known or understood.

Some remedies, at least, appear to be helpful for vaginal yeast infections, though more research is needed. For example, using probiotics as an adjuvant therapy could help cure yeast infections, but the quality of evidence is low or very low, according to a review published in November 2017 in the Cochrane Database of Systematic Reviews (16).

And boric acid, at least, is recommended for the treatment of non-albicans species. (12)

Can You Have Sex While You Have a Vaginal Yeast Infection?

Yeast infections are not considered sexually transmitted infections (STIs), as most are not transmitted person to person and they can occur in people who have never had sex. But having sex with a vaginal yeast infection can be, well, complicated.

There are a number of reasons you may want to wait until your infection clears to have sex:

  • Penetration may interfere with yeast infection treatment.
  • It might further irritate your vagina.
  • The yeast infection medication might damage condoms.
  • You can pass on the fungi to your partner (15 percent of men get an itchy rash on their penis if they have unprotected sex with a woman with a yeast infection). (13,14)

Prevention of a Yeast Infection

While the infections are not dangerous, they are uncomfortable and annoying enough that women may want to help prevent them. Risk-reducing steps include: (17)

  • Practice good hygiene.
  • Wear looser clothing in breathable fabrics.
  • Avoid scented sprays and bath products.
  • Don't douche.
  • Avoid certain medications (when possible).
  • Maintain proper diet, sleep, and exercise.
  • Keep the area around the vagina clean and dry. (1)

Complications of a Yeast Infection

Left untreated, vaginal yeast infections may cause a number of different complications, including:

Research and Statistics: How Many People Get Yeast Infections?

About 70 to 75 percent of women will get a vaginal yeast infection at least once in their lives. And 50 percent of these women will experience more than one infection. (6,17)

What's more, 5 to 8 percent of women experience recurrent or chronic yeast infections, and come down with four or more yeast infections in a single year. (17)

Vaginal yeast infection is the second most common type of vaginal infection, after bacterial vaginal infection, in the United States. It results in 1.4 million outpatient visits a year. (1)

Related Conditions and Causes of Yeast Infections

Vulvovaginal Candidiasis and Pregnancy

Candida yeast colonizes the vagina of at least 20 percent of all women — and 30 percent of all pregnant women.

Research suggests that vulvovaginal candidiasis is especially common among pregnant women; because of this, the infection is sometimes considered a complication of pregnancy.

Both the increased candida colonization and yeast infection rates during pregnancy appear to be caused by several pregnancy-related factors, including increased estrogen levels, reduced immunity, and increased concentrations of sugar (a food source for yeast) in vaginal secretions. (18)

The symptoms and severity of yeast infections are no different during pregnancy, but treatment varies slightly.

Applying a topical azole for seven days is the recommended treatment for yeast infections during pregnancy; oral azoles have not been proved safe for pregnant women.

In fact, research published in January 2016 in the Journal of the American Medical Association (JAMA) suggests oral azoles increase a pregnant woman's risk of spontaneous abortion. (19)

Diabetes and Vaginal Yeast Infections

Vaginal yeast infections are also considered a complication of type 2 diabetes, as the metabolic disease makes you more susceptible to the infection.

Diabetes mellitus also makes you more prone to infections by the azole-resistant species of yeast C. glabrata.

If your diabetes is uncontrolled, you'll have high levels of sugar in your blood, which also affects the levels of sugar in other areas of your body. Specifically, the mucous membrane in the vagina and vulva becomes saturated with sugar, allowing Candida to rapidly reproduce.

A diet high in refined sugars may contribute to a diabetic woman's risk of yeast infection. (6)

Nongenital Yeast Infections

Though the term "yeast infection" is most often used to refer to a vaginal infection, it also applies to other types of candidiasis.

A yeast infection of the mouth and throat is called thrush, or oropharyngeal candidiasis. (20)

When a yeast infection affects the esophagus (tube connecting the throat and stomach), it's called esophageal candidiasis, or Candida esophagitis. (5)

A yeast infection of the skin — which typically occurs in warm, moist areas, such as the armpits and groin — is called cutaneous candidiasis. (21)

And if candida gets into the bloodstream, such as from using a contaminated intravenous catheter or as a complication of thrush, the yeast can cause a deadly infection called invasive candidiasis. Here, it enters your bloodstream and travels to other parts of your body, including your lungs, liver, and heart valves.

It can cause infection or inflammation in various body parts, such as meningitis (infection of the membranes of the brain), esophagitis (esophagus), endophthalmitis (eyes), endocarditis (heart), urinary tract infections (UTIs), and arthritis (joints). (7,22)

Candida can cause an infection of the bloodstream itself, called candidemia. (23)

Invasive candidiasis most frequently affects people who are critically ill and in intensive care units, such as from yeast that travels to the bloodstream from the gut, or leakage after abdominal surgery. (24)

Doctors typically treat the infection with antifungal medication, but up to 40 percent of people with invasive candidiasis die regardless of treatment. (25)

Additionally, men can get yeast infections in their genitals (candidal balanitis), mouths, and other areas.

Resources We Love

For more go-tos on preventing, diagnosing, and, of course, treating yeast infections, here are some additional sources of information that can help.

Favorite Organizations for Yeast Infection Info

Mayo Clinic

The Mayo Clinic is a well-respected, integrated clinical practice, education, and research institution that prides itself on offering the most up-to-date medical information to the public. On this website users can readily access an easy-to-digest overview of yeast infections, but one of our favorite features is the "preparing for your appointment" section, which highlights questions patients will want to ask their healthcare provider during the diagnosis and treatment process.


MedlinePlus is the patient-centered offshoot of the U.S. National Library of Medicine, and offers need-to-know basics of yeast infections. But it’s also a thorough clearinghouse for the latest yeast infection clinical trials and published journal articles. We also love that the site breaks down yeast infection information by patient, like children, teens, and men.

Office on Women’s Health (OWH)

OWH is a part of the U.S. Department of Health and Human Services created to address critical health issues that affect women, making this an excellent source for yeast infection information. The fact sheet filled with frequently asked questions is especially helpful, as is their “Find a Health Center” widget.

Favorite Website for Kids’ Yeast Issues

Healthy Children

Powered by the pediatricians behind the American Academy of Pediatrics, the yeast infection section of their website highlights all the essential info needed on the hows and whys of yeast infections in girls and young women. We appreciate that the site also has solid info on other candida infections that children and teens can experience, complete with a symptom checker chart.

Favorite Yeast Infection News Subscription Service

Centers for Disease Control and Prevention (CDC)

The CDC has thorough and up-to-date info on all things related to vaginal candidiasis (aka vaginal yeast infections) and candida infections of the mouth, throat, and esophagus. But you don’t have to keep clicking to stay in the know. Instead, there’s a “get email updates” option where you can enter your contact info to automatically receive updated information on yeast infections (or any health topics of interest) directly to your inbox.

Favorite App for Those With Yeast Infections

Clue app

While it’s true that the Clue app (for iPhone and Android) is officially billed as a period and ovulation tracker, it’s also a super convenient way for frequent yeast infection sufferers to keep tabs on their discharge. Here, users can click off things like “egg white” or “sticky” to note what type of discharge they’re dealing with. Plus, users can record when it occurred and how it has changed, which allows women to better understand their bodies and spot potential yeast infections quickly.

Editorial Sources and Fact-Checking

  1. Vaginal Candidiasis. Centers for Disease Control and Prevention (CDC).
  2. Vaginal Yeast Infection. MedlinePlus.
  3. Patient Education: Vaginal Yeast Infection (Beyond the Basics). UpToDate.
  4. Yeast Infections During Pregnancy. American Pregnancy Association.
  5. Pappas et al. Clinical Practice Guideline for the Management of Candidiasis: 2016 Update by the Infectious Diseases Society of America. Clinical Infectious Diseases. February 2016.
  6. Sobel JD. Vulvovaginal Candidosis. The Lancet. July 2007.
  7. Rebecca Jeanmonod and Donald Jeanmonod. Vaginal Candidiasis (Vulvovaginal Candidiasis). StatPearls. January 2020.
  8. Yeast Infection. Jefferson University Hospitals.
  9. Martins et al. Candidiasis: Predisposing Factors, Prevention, Diagnosis and Alternative Treatment. Mycopathologia. May 1, 2014.
  10. Recurrent Yeast Infections. American Family Physician.
  11. Chew SY, Thian Lung Than L. Vulvovaginal Candidosis: Contemporary Challenges and the Future of Prophylactic and Therapeutic Approaches. Mycoses. January 13, 2016.
  12. 2015 Sexually Transmitted Diseases Treatment Guidelines: Vulvovaginal Candidiasis. CDC.
  13. Is It Safe to Have Sex With a Yeast Infection? Self. February 16, 2018.
  14. Vaginal Yeast Infections. Office on Women's Health.
  15. Felix et al. Alternative and Complementary Therapies for Vulvovaginal Candidiasis. Folia Microbiologica. September 30, 2018.
  16. Xie HY, Feng D, Wei DM, et al. Probiotics for Vulvovaginal Candidiasis in Non-Pregnant Women. Cochrane Database of Systematic Reviews. November 2017.
  17. Gonçalves et al. Vulvovaginal Candidiasis: Epidemiology, Microbiology, and Risk Factors. Critical Reviews in Microbiology. November 2016.
  18. Aguin TJ, Sobel JD. Vulvovaginal Candidiasis in Pregnancy. Current Infectious Disease Reports. June 2015.
  19. Mølgaard-Nielsen D, Svanström H, Melbye M, et al. Association Between Use of Oral Fluconazole During Pregnancy and Risk of Spontaneous Abortion and Stillbirth. Journal of the American Medical Association (JAMA). January 2016.
  20. Candida Infections of the Mouth, Throat, and Esophagus. CDC.
  21. Candida Infection of the Skin. MedlinePlus.
  22. Thrush — Children and Adults. MedlinePlus.
  23. Candida Infection of the Bloodstream — Candidemia. American Thoracic Society.
  24. Antinori S, Milazzo L, Sollima S, et al. Candidemia and Invasive Candidiasis in Adults: A Narrative Review. European Journal of Internal Medicine. October 2016.
  25. Kullberg BJ, Arendrup MC. Invasive Candidiasis. New England Journal of Medicine. October 2015.
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