Thrush on the tongue appears as raised, creamy white patches that look like cottage cheese. These patches are soft, slightly bumpy, and sit on top of the tongue’s surface. If you gently scrape or wipe them, they come off to reveal a red, raw area underneath that may bleed slightly. That combination of wipeable white patches over tender red tissue is the hallmark of oral thrush.
What the Patches Look Like Up Close
Thrush patches are not a thin film or coating. They’re distinctly raised, with an uneven, curd-like texture. The color is creamy white, sometimes with a slightly yellowish tint. They can range from a few small spots to larger patches that cover much of the tongue’s surface.
The patches tend to appear first on the top of the tongue and the inner cheeks. From there, they can spread to the gums, the roof of the mouth, the tonsils, and even the back of the throat. When thrush reaches the throat, swallowing can become painful.
One of the most telling features is what happens when you disturb the patches. Brushing your teeth or eating rough-textured food can partially dislodge them, leaving behind a reddened, sore area that bleeds a little. This bleeding response is actually useful for recognizing thrush, because other white mouth conditions behave differently.
How It Feels Beyond What You See
Thrush isn’t just a visual change. Your mouth may feel cottony or dry, and food can taste muted or slightly off. The patches themselves are often sore, especially when eating acidic or spicy foods. Some people describe a burning sensation on the tongue even when the patches are small. If the infection spreads to your throat, you may feel like food is getting stuck when you swallow.
Thrush vs. Other White Tongue Conditions
Not every white patch in the mouth is thrush. Two common look-alikes are leukoplakia and a normal milk-coated tongue in babies.
- Leukoplakia also produces white or grayish patches on the tongue and cheeks, but these patches are thick, firm, and rough-textured. The key difference: leukoplakia patches cannot be scraped off. They’re fused to the tissue underneath. Thrush patches are soft and wipe away easily, leaving that telltale red surface. Leukoplakia also tends to develop gradually over weeks and is more common in smokers and heavy alcohol users.
- Milk residue in babies is one of the most common sources of confusion for parents. A white coating on a baby’s tongue from breast milk or formula is normal and typically covers the tongue evenly. Thrush in infants looks different: the patches are odd-shaped, coat the inner cheeks and lips (not just the tongue), and cannot be easily wiped or washed away. If a white tongue is your baby’s only symptom, with no patches on the cheeks or lips, it’s likely just milk.
What Causes It
Thrush is caused by an overgrowth of Candida, a type of yeast that normally lives in your mouth in small amounts. Your immune system and the balance of other microorganisms usually keep it in check. When that balance tips, the yeast multiplies and forms the visible patches.
Common triggers include antibiotics (which kill off bacteria that compete with yeast), inhaled corticosteroids used for asthma (which suppress local immune defenses in the mouth), a weakened immune system, uncontrolled diabetes, dry mouth, and dentures that don’t fit well. Babies and older adults are more prone to thrush because their immune systems are either still developing or naturally weaker.
How Thrush Is Treated
Mild to moderate thrush is typically treated with an antifungal gel or liquid applied directly inside the mouth for 7 to 14 days. These topical treatments work well for most cases. If the infection is severe or has spread to the throat, an antifungal pill is usually prescribed instead.
Most people see the white patches start to shrink within a few days of starting treatment, though finishing the full course matters to prevent the infection from returning. If you use an inhaled corticosteroid for asthma, rinsing your mouth with water after each use can help prevent thrush from developing in the first place.