Healthy tonsils are small, pink, and tucked into the back corners of your throat. Swollen tonsils look noticeably larger, often redder, and may bulge toward the center of your throat. You can usually spot the difference yourself with a mirror, a light source, and a few seconds of looking, but the visual check is only part of the picture. What you feel matters just as much as what you see.
How to Check Your Tonsils at Home
Start by rinsing your mouth with water to clear away any food particles. Stand in front of a mirror in a well-lit room, or use a flashlight (your phone’s light works fine). Open your mouth as wide as you can and press your tongue flat against the bottom of your mouth, or stick it straight out. Saying “aaaahh” helps flatten the back of the tongue so you get a clearer view.
Your tonsils sit on either side of the back of your throat, just behind the tongue. When they’re at their normal size, they’re roughly the size of almonds and sit mostly within their small pockets (called the tonsillar fossa). When they’re swollen, they push out of those pockets and start taking up more of the space in the back of your throat. In moderate cases, each tonsil fills about a quarter to half of that opening. In severe cases, they can fill three-quarters of the space or even touch each other in the middle.
What Swollen Tonsils Look Like
Color is one of the easiest clues. Normal tonsils are roughly the same pink as the surrounding tissue. Inflamed tonsils turn a deeper red. In some infections, you’ll see white or yellowish patches on the surface. These patches are pus-filled spots called exudate, and they’re a hallmark of bacterial infections like strep throat. The surface of the tonsils may also look rougher or more textured than usual.
One thing that trips people up: small, hard, yellowish-white lumps on the tonsils aren’t always a sign of infection. These are often tonsil stones, which form when food debris, dead cells, and minerals like calcium get trapped in the tonsils’ natural crevices and harden. Tonsil stones are usually only 1 to 2 millimeters across, sometimes too small to see. They’re more common in people with large or deeply grooved tonsils and tend to cause bad breath rather than a sore throat. The key difference is that tonsil stones sit in the crevices like small pebbles, while infection-related patches look more like a coating or film spread across the surface, and they come with other symptoms like pain and fever.
Symptoms That Confirm the Swelling
What you feel often confirms what you see. Swollen tonsils typically come with a combination of these symptoms:
- Sore throat: Pain that gets worse when you swallow, and sometimes even when you’re not swallowing.
- Painful swallowing: Food and liquids feel like they’re scraping past the back of your throat.
- Tender neck glands: The lymph nodes just below your jaw and along the sides of your neck may feel swollen and sore to the touch.
- Ear pain: The nerves in your throat and ears are connected, so throat inflammation can cause referred pain in one or both ears even when the ears themselves are fine.
- Bad breath: Bacteria and dead tissue on inflamed tonsils produce a noticeable smell.
- Fever: Infections that cause tonsil swelling usually bring a fever, sometimes above 101°F (38.3°C).
- Voice changes: Your voice may sound muffled or thicker than normal, sometimes described as a “hot potato” voice, as if you’re talking around something in the back of your mouth.
Viral vs. Bacterial: How to Tell the Difference
Most cases of swollen tonsils are caused by viruses, the same ones responsible for the common cold or flu. Viral tonsillitis tends to come with a cough, runny nose, and a more gradual onset. The throat is red and sore, but you’re less likely to see white patches on the tonsils.
Bacterial tonsillitis, most commonly from group A strep, looks and feels different. It tends to hit suddenly with a high fever, intensely painful swallowing, and those characteristic white or yellow patches on the tonsils. Swollen, tender lymph nodes in the neck are more prominent. Notably, a cough is usually absent with strep. Clinicians use a scoring system that weighs exactly these factors: the presence of tonsillar exudate, swollen lymph nodes, fever, the absence of a cough, and the patient’s age. The more of these that line up, the higher the likelihood of a bacterial cause and the stronger the case for a rapid strep test.
You can’t diagnose strep throat just by looking. A rapid strep test or throat culture is the only way to confirm it, and that distinction matters because bacterial tonsillitis responds to antibiotics while viral tonsillitis does not.
Signs of Swollen Tonsils in Young Children
Toddlers and preschoolers can’t always tell you their throat hurts, so you have to watch their behavior. Refusing food or drinks is one of the earliest signs, especially if a child who normally eats well suddenly pushes meals away or cries during feeding. Excessive drooling can signal that swallowing has become painful enough that the child avoids it.
Chronically enlarged tonsils in children sometimes cause problems that aren’t obviously throat-related. Mouth breathing, loud snoring, and restless sleep can all point to tonsils large enough to partially block the airway. Over time, the resulting poor sleep leads to irritability, behavioral changes, and difficulty concentrating at school. If your infant is having trouble eating and gaining weight, or your older child has persistent noisy breathing during sleep, those patterns are worth flagging to a pediatrician. Occasional illness is normal, but ongoing sleep disturbances, constant mouth breathing, and unexplained irritability suggest the tonsils may be chronically enlarged rather than temporarily swollen from an infection.
When Swollen Tonsils Need Urgent Attention
Most swollen tonsils resolve on their own or with treatment within a week. But certain signs mean the swelling has become dangerous. Seek immediate care if you or your child experiences difficulty breathing, extreme difficulty swallowing (not just pain, but an inability to get liquids down), or excessive drooling. A sore throat lasting more than four days without improvement, or a fever over 101°F, also warrants a call to a healthcare provider.
One serious complication to be aware of is a peritonsillar abscess, where a pocket of pus forms beside the tonsil. This typically causes severe pain concentrated on one side of the throat, difficulty opening the mouth, and a visibly lopsided appearance when you look at the back of the throat, with one tonsil bulging much more than the other. This requires prompt medical treatment.