A yeast infection happens when a fungus called Candida, which normally lives in small amounts on your skin and in your body, grows out of control. This overgrowth is not something you catch from another person in most cases; it is usually triggered by a change in your own body’s environment. The most common causes are antibiotic use, high blood sugar, hormonal shifts, and moisture or heat trapped against the skin.
How Do You Get A Yeast Infection Causes Risks? Root Causes
Your body naturally hosts many types of bacteria and fungi, including Candida albicans. In a healthy state, these microorganisms keep each other in balance. When that balance tips, the yeast population can multiply rapidly, leading to an infection. The root cause is almost always a disruption of this normal microbiome, rather than exposure to a new germ.
The most common trigger is taking antibiotics. Antibiotics kill off the protective bacteria that normally keep yeast in check. Without those bacteria, yeast has room to grow. This is why yeast infections are so common after a course of antibiotics, especially broad-spectrum ones.
Another major root cause is high blood sugar. Yeast feeds on sugar. When blood sugar levels are elevated, such as in poorly controlled diabetes, the extra sugar creates a favorable environment for yeast to thrive. This is why women with diabetes often have more frequent and harder-to-treat yeast infections.
What Are the Most Common Risk Factors?
Several everyday habits and health conditions can raise your risk of a yeast infection. Some of these are within your control, and some are not.
- Antibiotic use: The most common cause, as described above.
- High blood sugar: Unmanaged diabetes or even a diet very high in refined sugar can feed yeast.
- Hormonal changes: Pregnancy, birth control pills, and hormone therapy can alter the vaginal environment.
- Warm, moist environments: Tight clothing, wet swimsuits, and sweaty workout gear create ideal conditions for yeast growth.
- Weakened immune system: Conditions like HIV, or treatments like chemotherapy, reduce your body’s ability to control yeast.
- Use of certain personal products: Scented soaps, douches, and vaginal sprays can disrupt the natural balance of bacteria and yeast.
It is important to note that having a yeast infection is not a sign of poor hygiene. In fact, over-washing or using harsh cleansers can make the problem worse by stripping away the protective bacteria.
How Do Yeast Infections Develop in the Body?
Yeast infections can occur in several parts of the body, and the way they develop is slightly different in each location. The most common site is the vagina, but oral thrush and skin infections are also frequent.
In the vagina, Lactobacillus bacteria normally produce acid that keeps yeast from growing. When those bacteria are reduced, either by antibiotics or hormonal changes, the vaginal pH shifts. This allows yeast cells to attach to the vaginal wall, multiply, and cause inflammation.
In the mouth, oral thrush appears as white patches on the tongue and inner cheeks. This is most common in infants, older adults, and people who use inhaled steroids for asthma. The same principle applies — a disruption in the normal oral flora allows yeast to take over.
On the skin, yeast infections often develop in skin folds like the armpits, groin, or under the breasts. These areas stay warm and moist, which yeast prefers. Friction and trapped sweat can also damage the skin barrier, making it easier for yeast to penetrate the outer layer.
What Does a Yeast Infection Actually Feel Like?
Symptoms vary depending on where the infection is located. Recognizing them is the first step to getting proper treatment.
For a vaginal yeast infection, the most common symptoms are intense itching and burning, especially around the vaginal opening. You may also notice a thick, white discharge that looks like cottage cheese. Redness and swelling of the vulva are common, and many women feel burning when urinating or during intercourse.
Oral thrush causes creamy white lesions on the tongue, inner cheeks, or roof of the mouth. These patches may bleed slightly when scraped. Some people experience a cotton-like feeling in the mouth, loss of taste, or pain when eating or swallowing.
Skin yeast infections typically appear as a red, itchy rash with well-defined edges. You might see small pustules or satellite lesions around the main rash. The skin may crack or feel sore, particularly in the creases where skin rubs together.
Important: These symptoms can also be caused by other conditions. Bacterial vaginosis, sexually transmitted infections, and contact dermatitis can all look similar to a yeast infection. If you are not certain what you have, a medical evaluation is necessary. Self-treating the wrong condition can delay proper care.
What Are the Risks of an Untreated Yeast Infection?
For healthy people, a yeast infection is uncomfortable but rarely dangerous. Most clear up with proper treatment. However, there are situations where the risk is more serious.
In people with weakened immune systems, yeast can enter the bloodstream. This is a condition called invasive candidiasis. It is a serious infection that can affect the blood, heart, brain, or other organs. This is rare in otherwise healthy individuals but is a real concern for people undergoing chemotherapy, organ transplant recipients, or those with advanced HIV.
Another risk is recurrent infections. Some women experience four or more yeast infections per year. This can be a sign of an underlying condition like uncontrolled diabetes or chronic antibiotic use. In some cases, the yeast becomes resistant to standard antifungal medications, making treatment more difficult.
During pregnancy, yeast infections are common due to hormonal shifts. They are not harmful to the baby, but they can be harder to treat and may require longer courses of therapy. Always inform your healthcare provider if you are pregnant before starting any treatment.
How Are Yeast Infections Treated?
Treatment depends on the location and severity of the infection. Most vaginal yeast infections are treated with antifungal creams, ointments, or suppositories that are inserted into the vagina. These are available over the counter. Oral antifungal pills like fluconazole are also highly effective and require a prescription.
For oral thrush, antifungal mouthwashes or lozenges are commonly used. The underlying cause — such as inhaled steroid use — should also be addressed. Rinsing the mouth with water after using steroid inhalers can help prevent thrush from developing in the first place.
Skin yeast infections respond well to topical antifungal creams. Keeping the affected area dry is just as important as applying the medication. Changing out of sweaty clothing promptly and using absorbent powders can help speed up healing.
One important note: over-the-counter treatments are effective for uncomplicated infections, but not all vaginal discharge is caused by yeast. If you have never been diagnosed with a yeast infection before, or if your symptoms are unusual, see a healthcare provider for an accurate diagnosis before using any product.
Can You Prevent a Yeast Infection?
Prevention focuses on maintaining the natural balance of your body’s microbiome and avoiding conditions that favor yeast growth.
Wearing breathable cotton underwear and avoiding tight-fitting pants can reduce moisture in the genital area. Change out of wet swimsuits or sweaty workout clothes as soon as possible. Avoid scented soaps, bubble baths, and vaginal douches, which can disrupt the natural flora.
If you take antibiotics, ask your doctor whether an antifungal treatment is appropriate to prevent a yeast infection. Some clinicians prescribe a single dose of fluconazole alongside a course of antibiotics for women who are prone to yeast infections. This is a common practice, though it is not universally recommended for everyone.
For people with diabetes, keeping blood sugar within target ranges is one of the most effective ways to reduce yeast infections. Dietary changes that reduce refined sugar intake may also help, though the evidence for this is less clear than the evidence for blood sugar control.
Probiotics are often marketed for yeast infection prevention. Some research suggests that certain strains of Lactobacillus may help maintain vaginal health, but the evidence is not strong enough to make a firm recommendation. No clinical guidelines currently recommend a specific probiotic product for this purpose.
Frequently Asked Questions
Can a man get a yeast infection from a woman?
Yes, but it is uncommon. Men can develop a yeast infection on the penis after sexual contact with an infected partner, though many men carry the yeast without symptoms.
How long does a yeast infection last without treatment?
Some mild infections may resolve on their own, but most will persist or worsen without treatment. Most treated infections clear up within a few days to a week.
Can you get a yeast infection from a public pool or hot tub?
No. Chlorinated water does not transmit yeast infections. The risk comes from sitting in a wet swimsuit after leaving the pool, which creates a moist environment that encourages yeast overgrowth.
Is a yeast infection a sexually transmitted infection?
No. Yeast infections are not classified as STIs. They can occur in people who have never been sexually active, and they are not spread through sexual contact in most cases.
