Three out of four women will have at least one yeast infection in their lifetime, and almost half will have two or more. If you have had one, you know the signs: intense itching, a thick white discharge, and an uncomfortable burning. You are in very common company.
What is less common is understanding why they happen. This guide walks through what a yeast infection is, what triggers one, how it differs from a UTI, and the everyday habits and vaginal health support that help keep your balance steady.
What Is a Yeast Infection?
Your vagina always contains a small amount of yeast, a fungus called Candida, living in balance with your protective bacteria. Under normal conditions, Lactobacillus keeps Candida in check by maintaining an acidic pH between 3.8 and 4.5.
A yeast infection, known medically as vaginal candidiasis, happens when that balance tips and Candida multiplies beyond its usual levels. It is most common after puberty and before menopause, and it shows up with the itching, irritation, and discharge most women recognize.
Symptoms of a Yeast Infection
Most yeast infections make the vaginal area itch and burn, but what you feel can vary a lot depending on how far the imbalance has progressed. Common signs include:
- Itching or burning in or around your vagina
- Thick, white discharge, often compared to cottage cheese
- Redness and tenderness around the vulva
- Small cuts or cracks in the vulvar skin
- Burning when you pee
- Discomfort during sex
Symptoms look different for everyone. Some women have intense itching with very little discharge, while others mostly notice burning. Because these signs can resemble BV or an STI, it is worth seeing a provider before reaching for an over-the-counter treatment.
Yeast Infection vs. UTI
It is easy to mix up a yeast infection and a urinary tract infection, but they are different problems. A UTI is an infection of the urinary tract: the bladder, urethra, kidneys, and ureters. Women get them more often because the urethra is shorter, so bacteria reach the urinary tract more easily.
UTI symptoms usually include burning when you pee, a frequent urge to go, and cloudy or strong-smelling urine, sometimes with lower-belly or back pain. A UTI is treated with antibiotics, and here is the catch: because antibiotics clear good bacteria along with the bad, a yeast infection sometimes follows a course of UTI treatment.
What Causes a Yeast Infection
Most yeast infections trace back to something that disrupted your microbiome. Here are the most common triggers.
1. Antibiotics
Antibiotics are one of the most common triggers. They clear harmful bacteria, but they also wipe out the protective Lactobacillus that keep Candida in check, which leaves room for yeast to grow.
Broad-spectrum types carry the highest risk, including tetracyclines, quinolones, and penicillins. If you are prescribed a course, pairing it with a vaginal probiotic like Good Girl Probiotics® can help support your bacterial balance.
2. High-sugar diets
Like most yeasts, Candida feeds on sugar. A diet high in refined carbs and added sugar creates an environment where yeast grows more easily, in both the gut and the vaginal microbiome.
You do not have to give up dessert, but if you are prone to infections, reining in processed foods and keeping blood sugar steady is one of the most practical changes you can make.
3. Unmanaged diabetes
When blood sugar runs consistently high, your body releases more glucose into your blood, saliva, urine, and vaginal secretions. That extra sugar gives yeast more to feed on, which is why women with poorly controlled diabetes are more likely to get yeast infections. Keeping blood sugar stable through diet, medication, and exercise can lower that risk.
4. A weakened immune system
A healthy immune system helps keep Candida from taking hold. When your defenses are down, whether from the flu or a condition like cancer or HIV, your body has a harder time regulating yeast.
If you deal with frequent infections or have a compromised immune system, your provider may recommend a longer-term treatment plan, and supporting your gut health alongside that care can give your body extra backup.
5. Hormone changes
Estrogen is a big player in vaginal health. When estrogen rises, during pregnancy, the second half of your cycle, or with birth control and hormone therapy, vaginal glycogen goes up. Lactobacillus breaks that glycogen into lactic acid, which supports your natural pH.
When glycogen spikes too high, though, it can tip the balance and give Candida extra fuel to grow. For daily support of healthy yeast levels and immunity, some women add Healthy V® Vitamin to their routine.
6. Douching
Douching does the opposite of what people hope. Instead of keeping you fresh, it strips away the protective Lactobacillus and disrupts your natural balance, which leaves more room for yeast and raises the risk of BV and STIs.
Your vagina is self-cleaning, and nothing needs to go inside it. For everyday care, a gentle pH-balanced cleanser on the vulva is all you need.
7. Sexual activity
Yeast infections are not classed as sexually transmitted infections, but sex can introduce bacteria and shift your pH, which sometimes leads to Candida overgrowth. Practicing safe sex and using condoms can help limit that disruption.
8. Heat and moisture
Candida thrives in warm, damp conditions. Tight synthetic fabrics and sitting in wet or sweaty clothes after a workout create exactly that environment. Breathable cotton underwear and changing out of damp clothes are quick habits that lower your risk.
How to Support a Healthy Vaginal Balance
Your vagina is good at balancing itself, but a few everyday habits make that easier, especially if you are prone to yeast infections.
The foundation is a daily probiotic. Good Girl Probiotics® is made with eight strains of lactobacilli and offers clinically studied support for healthy odor, a balanced pH, and healthy levels of vaginal yeast and bacteria. Here is more on how probiotics support vaginal health.
From there, a few simple habits go a long way:
- Choose breathable cotton underwear and change out of wet or sweaty clothes promptly
- Skip douching and fragranced washes
- Keep refined sugar in check, since Candida feeds on it
- Practice safe sex and change tampons regularly
If odor and a quick pH reset are also on your radar, boric acid suppositories are another option, and our guide on how to balance your vaginal pH covers the bigger picture.
When to See Your Doctor
Because yeast infection symptoms can look like BV or an STI, see your provider before reaching for an over-the-counter treatment if you are not sure what you are dealing with. An accurate diagnosis saves you from treating the wrong thing.
If you are getting them often, that is worth a closer look. Three or more in a year is considered recurrent, and it can point to an underlying factor like blood sugar or a weakened immune system that deserves professional attention. Supplements support a healthy environment, but they do not replace medical care.
Frequently Asked Questions
What is a yeast infection?
Vaginal candidiasis, the medical name for a yeast infection, is a fungal infection caused by an overgrowth of Candida, a yeast that normally lives in the vagina in small amounts. When the microbiome is disrupted, Candida multiplies beyond its usual levels and causes itching, irritation, and discharge.
What are recurrent yeast infections?
Recurrent yeast infections, called recurrent vulvovaginal candidiasis or RVVC, are usually diagnosed when you have three or more in a year. They are often tied to underlying factors like uncontrolled blood sugar, a weakened immune system, or a microbiome imbalance that has not been fully addressed, so they are worth discussing with your provider.
Are yeast infections an STI?
No. Yeast infections are not classed as sexually transmitted infections, though sexual activity can disrupt your pH and introduce bacteria, which sometimes contributes to an overgrowth.
Can probiotics help with yeast infections?
Probiotics support a balanced microbiome and a healthy vaginal pH, which is the environment that keeps Candida in check. They are everyday support rather than a treatment for an active infection, so think of them as part of your routine alongside a provider's care when you need it.
How long does a yeast infection last?
With the right treatment, mild yeast infections often clear within a few days to about a week. If your symptoms drag on past a week, keep coming back, or are severe, that is your cue to check in with a provider rather than keep treating on your own.
The Bottom Line
Yeast infections come down to balance. When the protective bacteria in your vagina dip and Candida overgrows, the familiar itch and discharge follow. Most of the triggers come back to that same balance, whether it is antibiotics, sugar, or moisture.
You can support it with a daily probiotic, sensible habits, and a quick visit to your provider when something feels off or keeps coming back. Explore Good Girl Probiotics® and our vaginal health collection for everyday ways to feel your best, at every stage of life.
Sources:
Warding Off Recurrent Yeast and Bacterial Vaginal Infections: Lactoferrin and Lactobacilli | NCBI
Urinary Tract Infections: Causes, Symptoms & Treatment | Cleveland Clinic
