Yes, Candida is the yeast responsible for yeast infections. Candida is a genus of fungi that lives naturally on your skin and inside your body, including your mouth, throat, gut, and vagina. It only becomes an infection when it grows out of control, and the resulting condition is called candidiasis, commonly known as a yeast infection.
So “Candida species” isn’t itself a yeast infection. It’s the organism that causes one. The distinction matters because carrying Candida is completely normal. Nearly everyone does. The infection happens when something disrupts the balance that keeps Candida in check.
How Candida Shifts From Harmless to Infectious
Candida normally coexists peacefully with the rest of your body’s microbes. Whether it stays harmless or turns into a problem depends on several overlapping factors: your immune status, the local environment in the tissue where it lives (pH, oxygen levels, moisture), and the balance of bacteria around it. When conditions change, Candida can physically shift forms, switching from a rounded yeast shape to elongated filaments that penetrate tissue and trigger inflammation.
Antibiotics are one of the most common triggers. They wipe out bacteria that normally compete with Candida for space and resources. Research published in Cell Host & Microbe found that Candida levels in the gut increased 15-fold during antibiotic treatment. That same disruption weakened key immune defenses in the gut lining, making it easier for Candida to gain a foothold and, in severe cases, even cross into the bloodstream.
Which Candida Species Cause Infections
There are many Candida species, but five cause the vast majority of serious infections: C. albicans, C. glabrata, C. parapsilosis, C. tropicalis, and C. krusei. Together, these five are responsible for up to 95% of Candida bloodstream infections in the United States. C. albicans is the single most common cause overall, though non-albicans species collectively account for roughly two-thirds of bloodstream cases.
One species getting increasing attention is C. auris, which can resist multiple antifungal drugs and spreads easily in healthcare facilities. The CDC tracked 6,304 new clinical cases of C. auris in the U.S. in 2024 alone, with over 17,000 cumulative cases since 2016. It primarily affects people who are already seriously ill in hospital settings, not the general population.
Types of Candida Infections and Their Symptoms
Candida causes different infections depending on where the overgrowth happens. The symptoms vary significantly by location.
Vaginal Yeast Infections
This is the type most people think of when they hear “yeast infection.” Vaginal candidiasis is one of the most common fungal infections overall. Symptoms include vaginal itching or soreness, pain during sex, discomfort when urinating, and abnormal discharge. Severe cases can involve redness, swelling, and small cracks in the vaginal wall.
Oral Thrush
When Candida overgrows in the mouth and throat, it causes white patches on the inner cheeks, tongue, and roof of the mouth. You may notice a cotton-like feeling, loss of taste, pain while eating or swallowing, and cracking at the corners of the mouth.
Esophageal Candidiasis
If the infection extends deeper into the esophagus, the main symptoms are pain and difficulty swallowing. This form is less common and typically affects people with weakened immune systems.
Invasive Candidiasis
The most serious form occurs when Candida enters the bloodstream or internal organs. This is a medical emergency that primarily affects hospitalized patients, particularly those with central venous catheters, recent surgery, or severely suppressed immune systems.
Who’s Most at Risk
Certain medications and health conditions make Candida overgrowth far more likely. Antibiotics, steroids, and chemotherapy all increase risk across every type of candidiasis. So do conditions that compromise the immune system, including HIV/AIDS, cancer, and diabetes.
For vaginal yeast infections specifically, pregnancy, hormonal birth control, diabetes, and recent antibiotic use are the main risk factors. Oral thrush is more common in people who wear dentures, use inhaled corticosteroids for asthma, have chronic dry mouth, or smoke. Invasive candidiasis tends to affect people in intensive care units, those receiving IV nutrition, organ transplant recipients, people on dialysis, and those who inject drugs.
How Candida Infections Are Diagnosed
Diagnosis is usually straightforward. For a vaginal yeast infection, a healthcare provider takes a small sample of discharge and examines it under a microscope or sends it for a fungal culture. Oral thrush is diagnosed similarly, with a swab from the mouth or throat sent to a lab. For suspected bloodstream infections, a blood sample is cultured to see if Candida grows.
These tests identify not just whether Candida is present but which species is involved, which matters because different species respond differently to treatment.
How Candida Infections Are Treated
Treatment depends on the type and severity of the infection. Vaginal yeast infections are typically treated with an antifungal cream applied inside the vagina or a single oral dose of fluconazole. If symptoms don’t improve, your provider may adjust with additional doses or switch to alternatives like boric acid or nystatin.
Mild oral thrush is treated with an antifungal gel applied inside the mouth for one to two weeks, using medications like clotrimazole, miconazole, or nystatin. Severe cases may require oral or intravenous antifungals. Esophageal infections are almost always treated with fluconazole, either as a pill or through an IV for more serious cases.
Invasive candidiasis requires hospital-level treatment with intravenous antifungals, typically from a class called echinocandins. This is the form where species identification becomes critical, since some species, particularly C. auris and C. krusei, are resistant to commonly used drugs.