Candida is a type of yeast, and when it overgrows, it causes what most people call a yeast infection. The medical term for this is candidiasis. So Candida is the organism, and a yeast infection is what happens when that organism gets out of control. Nearly all yeast infections in humans are caused by one of five Candida species, with Candida albicans being the most common by far.
Candida Lives in Your Body Normally
Candida isn’t automatically a problem. It lives on your skin and mucosal surfaces (mouth, gut, vagina) as part of your normal microbial community. A healthy immune system and a balanced population of other microbes keep it in check. The trouble starts when something disrupts that balance: a course of antibiotics that wipes out competing bacteria, a weakened immune system, or shifts in the local environment like pH changes or high blood sugar.
When conditions shift in Candida’s favor, it can rapidly multiply and transition from a harmless resident to an active infection. The fungus is remarkably adaptable. It can thrive across wide ranges of temperature, oxygen levels, acidity, and nutrient availability, which is why it’s capable of infecting so many different parts of the body.
Types of Candida Infections
Yeast infections look and feel quite different depending on where they occur.
Vaginal Yeast Infections
This is the type most people picture when they hear “yeast infection.” Symptoms include vaginal itching or soreness, pain during sex, discomfort when urinating, and abnormal discharge that’s typically thick, white, and odorless. You may also notice redness, swelling, or small cracks in the vaginal wall. About three out of four women will experience at least one vaginal yeast infection in their lifetime.
Oral Thrush
Candida in the mouth and throat produces white patches on the inner cheeks, tongue, and roof of the mouth. It often comes with a cottony feeling, loss of taste, pain while eating or swallowing, and cracking at the corners of the mouth. Thrush is common in infants, older adults, and people with compromised immune systems.
Invasive Candidiasis
When Candida enters the bloodstream, it becomes a serious medical condition called candidemia. This primarily affects hospitalized patients, especially those with central venous catheters or diabetes. Surveillance across 10 U.S. sites found an incidence of about 7.4 cases per 100,000 people, with an all-cause in-hospital mortality rate of 32.6%. This is a fundamentally different condition from a vaginal yeast infection or thrush, even though the same family of organisms is responsible.
How Yeast Infections Differ From BV
Vaginal yeast infections are frequently confused with bacterial vaginosis (BV), since both cause irritation and discharge. The discharge is the easiest way to tell them apart. Yeast infection discharge is thick, white, and has no odor. BV discharge tends to be grayish, thin or foamy, and has a distinct fishy smell. A third possibility, trichomoniasis, produces frothy, yellow-green discharge that smells bad and may contain spots of blood. Getting the right diagnosis matters because each condition requires a different treatment.
Treatment Options
Most surface-level Candida infections respond well to antifungal medications. Vaginal yeast infections are typically treated with an antifungal cream applied inside the vagina or a single oral pill. For mild cases, over-the-counter options work fine. Oral thrush is usually treated with an antifungal gel applied inside the mouth for 7 to 14 days. Severe mouth or throat infections may require pills instead.
Invasive candidiasis requires intravenous antifungal treatment in a hospital setting and is managed by infectious disease specialists.
The Rise of Drug-Resistant Candida
One Candida species, Candida auris, has become a growing public health concern. It can resist multiple antifungal drugs, spreads easily in healthcare facilities, and mostly affects people who are already seriously ill. Clinical cases reported to the CDC have climbed steeply, from just 48 in 2016 to 6,304 in 2024. The rate of increase has slowed since 2022, but the organism continues to spread into new geographic areas. For the average healthy person, C. auris is not a day-to-day concern, but it highlights why accurate diagnosis and appropriate treatment matter.
Do Dietary Changes Help?
You may have seen “Candida cleanse” diets promoted online, often centered on cutting sugar, white flour, and processed foods. The logic sounds reasonable since yeast feeds on sugar, but the evidence doesn’t support it as a treatment. According to Mayo Clinic, there are no clinical trials showing that a Candida cleanse diet treats any known medical condition, and there is little proof that dietary changes improve the effects of a significant yeast overgrowth. Cutting processed foods has general health benefits, but it’s not a reliable strategy for resolving an active infection.
Practical steps with stronger evidence include avoiding unnecessary antibiotic use, wearing breathable cotton underwear, changing out of wet clothing promptly, and managing blood sugar if you have diabetes. These address the environmental conditions that allow Candida to overgrow in the first place.