Thrush shows up as creamy white patches in the mouth that look like cottage cheese, or as thick white discharge and intense itching in the vaginal area. It’s caused by an overgrowth of yeast that normally lives on your body in small amounts. The telltale signs depend on where the infection develops, but most cases are easy to spot once you know what to look for.
Signs of Oral Thrush
Oral thrush creates slightly raised, creamy white patches on your tongue, inner cheeks, and sometimes the roof of your mouth, gums, or tonsils. The texture is distinctive: the patches look like cottage cheese sitting on the surface of your mouth. If you gently brush or scrape one of these patches away, you’ll find a red, tender area underneath that may bleed slightly. That scraping test is actually one of the main ways to tell thrush apart from other white mouth lesions.
Beyond the visible patches, you may notice a cottony feeling in your mouth, like something is coating the inside. Some people lose their sense of taste or develop a metallic taste. Others feel a burning sensation but have no other obvious symptoms. It’s possible to have oral thrush with barely any discomfort at all, so checking visually is important. Open your mouth in front of a mirror with good lighting and look at your tongue, the insides of your cheeks, and the roof of your mouth for any white or off-white raised spots.
Signs of Vaginal Thrush
Vaginal thrush produces a thick, white discharge that also has that characteristic cottage cheese appearance. The discharge is usually odorless or very mild, and it can be watery in some cases. The hallmark symptom, though, is itching. The vagina and vulva typically become itchy and red, and the irritation can range from mildly annoying to severe enough to disrupt sleep. You may also feel a burning sensation, especially during urination.
About two-thirds of people who think they have a yeast infection are correct, but the symptoms overlap enough with other conditions that it’s worth paying attention to the details, particularly if this is your first time experiencing them.
How Thrush Differs From Similar Conditions
In the mouth, other conditions can also cause white patches. Leukoplakia creates white plaques that look somewhat similar but cannot be wiped away. Thrush patches scrape off; leukoplakia patches don’t. If you try gently brushing a white spot with a soft toothbrush and it stays firmly in place, it’s not thrush.
For vaginal symptoms, the condition most commonly confused with thrush is bacterial vaginosis (BV). The differences are straightforward once you know them:
- Discharge: Thrush produces thick, white, cottage cheese-like discharge. BV causes thin discharge that’s gray or yellow.
- Smell: Thrush typically has no noticeable odor. BV is associated with a strong, fishy smell.
- Itching: Thrush causes significant itching and sometimes burning. BV generally doesn’t cause either.
These two conditions require completely different treatments, so getting the right one matters.
Thrush in Babies and Breastfeeding
Babies develop oral thrush frequently, and the signs look similar to what adults experience: white, velvety sores on the tongue and inside the mouth that may bleed when wiped. A baby with thrush may become unusually fussy, refuse to nurse because of mouth soreness, or develop a diaper rash at the same time (yeast can affect both ends of the digestive tract).
If you’re breastfeeding a baby with thrush, the infection can transfer to your nipples. Signs of nipple thrush include deep pink, cracked, and sore nipples along with pain that persists during and after nursing. The pain is often described as a sharp, shooting sensation that goes beyond normal breastfeeding soreness. Both you and the baby need to be treated at the same time, or you’ll keep passing the infection back and forth.
What Makes Thrush More Likely
Certain situations make yeast overgrowth much more probable, so if you’re experiencing symptoms and any of these apply to you, thrush becomes a stronger possibility.
Antibiotics are one of the most common triggers. Broad-spectrum antibiotics kill off the normal bacteria that keep yeast in check, creating an opening for overgrowth. If your symptoms started during or shortly after a course of antibiotics, thrush is a very likely explanation.
Steroid inhalers used for asthma or COPD are a major risk factor for oral thrush specifically. Prolonged use suppresses the immune defenses in your mouth and throat, making it easier for yeast to take hold. Using a high dose, having poor oral hygiene, or not rinsing your mouth after using an inhaler all increase the risk further.
Other factors that raise your chances include diabetes (especially when blood sugar is poorly controlled), a weakened immune system from conditions like HIV or cancer treatment, smoking, wearing dentures (over 60% of removable denture users carry yeast on their prosthetics), pregnancy, and nutritional deficiencies. Older adults are also more vulnerable.
How Thrush Is Confirmed
For oral thrush, a healthcare provider can usually diagnose it just by looking inside your mouth. The appearance is distinctive enough that lab tests aren’t always necessary. If there’s any doubt, they may take a small swab from the affected area and examine it under a microscope to confirm yeast is present.
For vaginal thrush, a provider may examine a sample of discharge under a microscope or send it to a lab. This is especially worthwhile if it’s your first infection, if your symptoms don’t match the classic pattern, or if over-the-counter treatments haven’t worked. Getting a proper diagnosis rules out BV and other infections that need different treatment.
Treatment and What to Expect
Vaginal thrush responds well to antifungal treatments available over the counter, including creams and suppositories that work in one to seven days depending on the formulation. A single-dose prescription pill is also an option. Treatment clears symptoms and eliminates the infection in 80% to 90% of people who complete the full course. If you’ve had thrush before and recognize the symptoms clearly, starting with an over-the-counter antifungal cream is reasonable.
Oral thrush is treated with antifungal medications, usually in the form of a liquid you swish around your mouth or a lozenge you dissolve slowly. Most uncomplicated cases clear within one to two weeks. If you use a steroid inhaler, rinsing your mouth with water after each use and spitting it out can help prevent recurrences.
When Thrush Signals Something Bigger
In otherwise healthy people, thrush is a nuisance, not a danger. But thrush that keeps coming back, resists treatment, or shows up without an obvious trigger can sometimes point to an underlying issue like undiagnosed diabetes or an immune system problem. Recurrent vaginal thrush (four or more episodes in a year) warrants further investigation.
In people with severely weakened immune systems, yeast can occasionally enter the bloodstream and cause invasive infection. This is rare outside of hospital settings, but a fever and chills that don’t respond to standard antibiotic treatment in someone who is immunocompromised is a warning sign that needs prompt medical attention.