About 75 percent of women experience at least one yeast infection in their lifetime, and roughly half will have a second. The medical term, vaginal candidiasis, refers to overgrowth of Candida fungi (most often Candida albicans) in the vagina. The infection is rarely dangerous, but the itching, burning, and irritation can be intense, and a meaningful slice of cases are misdiagnosed because the symptoms overlap with bacterial vaginosis and other conditions. Knowing what a real yeast infection looks like is half the battle.
What Vaginal Candidiasis Is
Candida fungi are normal residents of the vagina, mouth, and gut, kept in check by the body’s other microbes and by the immune system. When that balance shifts (often after antibiotics, during pregnancy, or with elevated blood sugar), Candida can multiply and produce inflammation. CDC treatment guidelines classify candidiasis as uncomplicated (sporadic, mild to moderate, by Candida albicans, in an immunocompetent woman) or complicated (recurrent, severe, non-albicans species, or in pregnant or immunosuppressed patients). The distinction matters because complicated infections need different treatment.
Candidiasis is not classified as a sexually transmitted infection, though sexual activity can sometimes trigger it. The fungus is part of the normal flora and does not require transmission to cause disease.
Common Causes and Triggers
Antibiotic use is the most consistent trigger. Broad-spectrum antibiotics suppress the protective lactobacilli in the vagina, allowing Candida to overgrow. Hormonal shifts (pregnancy, hormonal contraception in some women, the luteal phase of the menstrual cycle) raise the risk. Diabetes, especially when poorly controlled, supplies excess glucose that fuels yeast growth. Immunosuppression from medications, HIV, or chemotherapy increases susceptibility.
Practical triggers include tight, non-breathable clothing, prolonged time in wet swimsuits or workout clothes, douching (which disrupts vaginal flora), and certain hygiene products. Sexual activity does not cause infection in most cases but can introduce friction and microtrauma that allows symptomatic overgrowth. Sugar in the diet does not directly cause yeast infections in women without diabetes, despite popular belief.
Symptoms to Recognize
The classic symptoms are intense vulvar and vaginal itching, often the first thing women notice, accompanied by burning during urination or intercourse. Discharge is typically thick, white, and “cottage cheese-like,” though some women have minimal discharge. Vulvar redness, swelling, and small fissures or skin breakdown are common with more severe infections.
What yeast infections do not produce: a fishy odor (that points to bacterial vaginosis), frothy or yellow-green discharge (suggesting trichomoniasis), or pelvic pain (suggesting PID or another diagnosis). Self-diagnosis accuracy is famously poor. Studies have found that fewer than 35 percent of women who self-diagnose a yeast infection actually have one. This matters because over-the-counter antifungals do nothing for BV or trichomoniasis, and treatment delay can prolong symptoms unnecessarily.
Diagnosis
For a first or atypical yeast infection, in-office testing improves accuracy. Microscopic examination of vaginal discharge mixed with potassium hydroxide reveals yeast hyphae or budding forms. Vaginal pH testing helps distinguish yeast (pH less than 4.5) from BV or trichomoniasis (pH greater than 4.5). DNA-based panels (such as the BD Affirm or Aptima molecular tests) detect Candida along with BV and trichomoniasis simultaneously.
Recurrent yeast infections (4 or more in a year) warrant species identification through a vaginal yeast culture. Some women carry Candida glabrata or Candida krusei rather than Candida albicans, and these species are intrinsically resistant to standard fluconazole and require alternative regimens, per CDC guidance. Diabetes screening, HIV testing, and immune evaluation are appropriate in women with recurrent or severe infection.
Treatment Options
Uncomplicated yeast infections respond to either topical or oral antifungal therapy. Topical options (clotrimazole, miconazole, terconazole) come as creams or suppositories in 1-, 3-, or 7-day regimens and are available over the counter. They produce cure rates of 80 to 90 percent.
Oral fluconazole 150 mg as a single dose is equally effective for uncomplicated infection and is more convenient. It does require a prescription but has rapid action and high patient preference. Severe symptoms often warrant a second dose 72 hours later.
Complicated or recurrent infections need longer or different treatment. Severe infections often need 2 weeks of topical therapy or two fluconazole doses 72 hours apart. Recurrent yeast infections benefit from a 14-day induction with topical or oral antifungal followed by 6 months of suppressive fluconazole 150 mg weekly. Non-albicans species (especially C. glabrata) require boric acid suppositories (600 mg vaginally daily for 14 days) or specialized agents. Boric acid is highly effective but is toxic if swallowed and is not used during pregnancy.
Treatment During Pregnancy
Yeast infections are common during pregnancy because elevated estrogen alters vaginal flora. Topical azoles (clotrimazole, miconazole) for 7 days are the recommended treatment. Oral fluconazole is generally avoided in pregnancy, particularly in the first trimester, because of conflicting data on birth defect risk. ACOG guidance reflects this conservative approach.
Prevention Strategies
Prevention focuses on supporting healthy vaginal flora. Wear breathable cotton underwear and avoid prolonged time in damp clothing. Skip douches, scented soaps, vaginal deodorants, and bubble baths, all of which disrupt the vaginal microbiome. Wipe front to back. Avoid antibiotics when not clearly indicated, since unnecessary antibiotic exposure is a leading cause of secondary yeast infections.
For women on antibiotics with a history of yeast infections, prophylactic oral fluconazole at the start and end of the antibiotic course is sometimes used. Probiotic use (oral or vaginal Lactobacillus strains) has modest evidence for prevention but is reasonable to try given the safety profile. Glycemic control matters substantially in women with diabetes. The broader women’s health conditions overview covers prevention strategies across multiple gynecologic infections.
When to See a Doctor
See a clinician for a first suspected yeast infection (to confirm the diagnosis), symptoms that do not improve after 3 days of OTC treatment, recurrent infections (more than 3 to 4 per year), pregnancy, or immunocompromised status. Severe symptoms (extensive vulvar swelling, fissures, fever) also warrant in-person evaluation.
When to seek emergency care: Call 911 or go to the nearest emergency room if you experience high fever (over 101 degrees Fahrenheit), severe pelvic pain, foul-smelling discharge with rapid worsening, or signs of systemic infection. Yeast infections rarely become emergencies, but these features suggest a different or more serious diagnosis. Untreated UTIs and PID can mimic some yeast infection symptoms but require very different management.
Frequently Asked Questions
Can my partner give me a yeast infection?
Sexual transmission is uncommon. Candida is part of normal flora, and male partners typically carry small amounts that rarely cause symptoms. If a male partner develops a rash on the penis, treating him helps. Routine partner treatment is not recommended for uncomplicated infection.
Why do I keep getting yeast infections?
Common reasons include unrecognized diabetes, frequent antibiotic use, hormonal contraception, immune compromise, and non-albicans Candida species that resist standard treatment. A vaginal yeast culture and bloodwork can clarify the cause. Recurrent infection benefits from a structured 6-month suppressive regimen.
Do probiotics prevent yeast infections?
Evidence is modest but favorable for certain Lactobacillus strains. Oral or vaginal probiotics are reasonable for women with recurrent infections, particularly during and after antibiotic courses. They are not a replacement for antifungal treatment in active infection.
Can I have sex with a yeast infection?
You can, but it may be uncomfortable, and friction can worsen symptoms. Antifungal creams can weaken latex condoms and diaphragms. Most providers recommend completing treatment before resuming intercourse, both for comfort and to allow the irritation to settle.
The Practical Takeaway
Yeast infections are common, usually mild, and easy to treat when correctly diagnosed. Self-diagnosis is unreliable, so a first or atypical case deserves an in-office evaluation. Standard treatments (topical azole creams or oral fluconazole) cure the great majority of uncomplicated cases. Recurrent or treatment-resistant infections need a culture, attention to underlying drivers like diabetes or frequent antibiotic use, and sometimes specialized regimens including boric acid for non-albicans species. Persistent itching with discharge that does not match the textbook yeast picture is more often BV than candidiasis, and getting that distinction right saves time and discomfort.