Swollen tonsils appear as enlarged, rounded masses of tissue on either side of the back of your throat. In their normal state, tonsils are small, pinkish, and roughly almond-sized, sitting neatly within the folds of tissue (called tonsillar pillars) that frame them. When swollen, they bulge beyond those folds, look visibly puffy, and often turn red or darker pink. Depending on the cause, you may also see white patches, spots, or a coating on their surface.
What Healthy Tonsils Look Like
Healthy tonsils are pale pink and blend in with the surrounding tissue at the back of your throat. Their surface isn’t perfectly smooth. Like sponges, tonsils have small craters and grooves called crypts that are a normal part of their structure. These pits help the tonsils do their job of trapping and filtering germs. In some people, healthy tonsils are barely visible. In others, they’re naturally a bit larger but still sit within the tonsillar pillars without crowding the throat.
Having visible tonsils doesn’t automatically mean something is wrong. The key differences to look for are color changes, a sudden increase in size, and anything on their surface that wasn’t there before.
The Visual Signs of Swollen Tonsils
The most obvious change is size. Swollen tonsils push out from the tonsillar pillars and can narrow the space at the back of your throat. Doctors use a grading scale (the Brodsky scale) that measures how much of that space the tonsils take up. At grade 1, the tonsils fill less than 25% of the opening. At grade 4, they fill more than 75%, leaving only a narrow gap. When tonsils reach grade 3 or 4, you can often see them touching or nearly touching in the middle of the throat, sometimes making the small dangling tissue in the center (the uvula) hard to see.
Beyond size, swollen tonsils typically look red and irritated. The surface may appear bumpy or uneven. You might notice the tiny blood vessels on the surface are more visible than usual, giving the tonsils a deeper, angrier color compared to the surrounding pink tissue.
White Patches, Spots, and Coatings
White or yellowish material on swollen tonsils is one of the most common things people notice, and what it looks like can help point toward the cause.
With strep throat, you’ll often see white patches, spots, or streaks of pus scattered across the tonsils and the back of the throat. The tonsils themselves look red and swollen, and you may also notice tiny red dots (called petechiae) on the roof of your mouth. One useful clue: strep throat doesn’t typically cause a cough. If you have a cough along with other cold symptoms, a viral infection is more likely.
Viral infections like mono can also produce a whitish coating on the tonsils, but it tends to look different. Rather than distinct spots or streaks, mono often creates a thicker, more widespread whitish material that drapes over the tonsil surface. The surrounding throat looks red and inflamed.
Tonsil stones are another cause of white spots, but they look distinctly different from infection. They appear as small, hard, pebble-like lumps lodged in the crevices of your tonsils, white or yellowish in color. Unlike the soft patches of pus from an infection, tonsil stones are firm, calcified bits of trapped debris. They’re usually small and sit in one or two of the tonsil’s natural grooves rather than spreading across the surface. They often cause bad breath but not the widespread redness and pain that infections do.
One Tonsil Bigger Than the Other
It’s common for one tonsil to swell slightly more than the other during a routine infection, and that’s usually nothing to worry about. But a noticeably lopsided appearance, where one tonsil is significantly larger than the other, deserves attention. A review of 267 tonsillectomies found that when surgery was performed for asymmetrical tonsils, 80% turned out to be benign, but 20% revealed something more serious. The strongest warning signs were swollen lymph nodes in the neck and an unusual appearance of the tonsil surface.
A peritonsillar abscess is another reason one side may look dramatically swollen. This is a pocket of pus that forms next to a tonsil, creating a visible bulge above and beside the affected tonsil. A hallmark sign is that the uvula gets pushed away from the swollen side, shifting visibly off-center. The affected area looks tight and swollen, and opening the mouth becomes painful and difficult.
What Swollen Tonsils Look Like in Children
Children’s tonsils are naturally larger relative to their throat size and tend to be most prominent between ages 3 and 7 before gradually shrinking. Because of this, mildly enlarged tonsils in a young child aren’t always a concern. The visual signs of a problem are similar to adults: redness, puffiness, and any white patches or coating.
What’s different in children is that chronically enlarged tonsils (and adenoids, which sit behind the nose and can’t be seen by looking in the mouth) often show up through indirect signs rather than throat pain. A child with persistently swollen tonsils may breathe through the mouth instead of the nose, snore regularly, speak with a nasal quality, or have recurring ear infections. If your child’s tonsils look large enough to nearly touch in the middle of the throat and you notice any of these patterns, that combination is worth bringing up with their pediatrician.
How to Check Your Tonsils at Home
Stand in front of a well-lit mirror, open your mouth wide, and press your tongue down with the back of a spoon or a tongue depressor. You should be able to see the tonsils sitting on either side of the back of your throat, framed by arches of tissue. A flashlight or your phone’s light aimed at the back of your throat makes a big difference.
Look for size first. If the tonsils bulge well past the arches or crowd toward the center, they’re enlarged. Then check color. Healthy tissue is pale pink; inflamed tissue will be noticeably redder. Finally, scan the surface for anything white, yellow, or unusual. Distinct white streaks or patches alongside a red, painful throat suggest infection. A small, hard white lump sitting in a crevice is more likely a tonsil stone. A thick whitish coating across the surface, especially with extreme fatigue, could point toward mono.
If you see a dramatic bulge on one side with the uvula pushed off-center, or if swelling is severe enough that swallowing liquids or breathing feels difficult, that warrants prompt medical attention rather than a wait-and-see approach.