Tonsillitis in adults typically shows up as visibly red, swollen tonsils at the back of the throat, often with white or yellowish patches or a coating on their surface. Your throat will look noticeably inflamed, and depending on the cause, the appearance can range from a deep red with no coating to tonsils so swollen and covered in white material that they nearly touch in the middle.
What You’ll See in the Mirror
If you open your mouth wide and look at the back of your throat (or use a flashlight), healthy tonsils are small, pink, and blend into the surrounding tissue. With tonsillitis, several things change. The tonsils themselves become enlarged, sometimes dramatically, and turn a deeper red. The surrounding throat tissue, including the soft palate and the back wall of the throat, often looks red and irritated too.
White or yellow patches on the tonsil surface are one of the most recognizable signs. These patches are called exudates, and they’re collections of dead cells, bacteria or viral debris, and immune cells. They can appear as scattered spots, streaks, or a more continuous whitish coating across the tonsils. Not every case of tonsillitis produces these patches. Some infections cause redness and swelling alone, with no visible coating at all.
You may also notice that the lymph nodes on the sides of your neck, just below and behind your ears, are swollen and tender to the touch. They can feel like firm, marble-sized lumps under the skin. A fever above 100.4°F (38°C) is common alongside the visible throat changes.
Viral vs. Bacterial: How They Look Different
Most adult tonsillitis is viral, caused by the same viruses behind colds and flu. Viral tonsillitis tends to produce a red, swollen throat with a more generalized look: the redness spreads across the throat rather than concentrating just on the tonsils. You’re more likely to also have a runny nose, cough, and hoarseness. White patches are less common with viral infections, though they can still appear.
Bacterial tonsillitis, most commonly from group A strep, often looks more intense and localized. The tonsils themselves are the star of the show: bright red, swollen, and frequently dotted or coated with those white or yellow exudates. Strep throat also tends to come on suddenly, with a high fever and significant pain but without a cough or runny nose. Doctors use a scoring system where the combination of fever, no cough, visible exudates on the tonsils, and swollen tender neck glands raises the probability of a bacterial cause. When all four of those features are present, roughly 57% of adults test positive for strep. When none are present, only about 7% do.
The tricky part is that mononucleosis (caused by Epstein-Barr virus) can look nearly identical to strep. The throat appears red, the tonsils are coated with whitish material, and the swelling can be severe. Mono and strep are so visually similar that distinguishing them usually requires a throat swab or blood test rather than appearance alone. Mono is worth considering in adults who also have extreme fatigue, body aches, and swelling in lymph nodes beyond just the neck.
Symptoms Beyond What You Can See
The visual changes come with a cluster of symptoms that reinforce what’s going on. Swallowing feels painful, sometimes severely so, and the pain can radiate to your ears. Your voice may sound muffled or scratchy, as if you’re talking with something stuck in the back of your throat. Bad breath is common because of the bacterial buildup on inflamed tissue. Some adults also notice a stiff neck from the swollen lymph nodes.
Fever patterns vary. Viral tonsillitis often produces a low-grade fever that hovers around 100 to 101°F. Bacterial infections can push higher. A fever above 101°F (38.3°C) alongside the classic throat appearance is one of the signals that warrants a strep test.
When the Appearance Signals Something Worse
Occasionally, tonsillitis progresses to a peritonsillar abscess, a pocket of pus that forms beside the tonsil. This looks distinctly different from standard tonsillitis and is important to recognize. One side of the throat becomes dramatically more swollen than the other. The soft palate on the affected side bulges outward, and the small tissue that hangs in the center of your throat (the uvula) gets pushed to the opposite side. The tonsil on the affected side looks like it’s being shoved downward and toward the middle of the throat.
A peritonsillar abscess also causes difficulty opening your mouth, sometimes to the point where you can barely separate your teeth. Your voice takes on a distinctive “hot potato” quality. If you notice one-sided swelling with the uvula shifted to the other side, or you suddenly can’t open your mouth normally, that’s a situation that needs same-day medical attention. Abscesses require drainage and can compromise your airway if left untreated.
How It’s Treated
If a strep test comes back positive, the standard treatment is a 10-day course of antibiotics, typically penicillin or amoxicillin. Alternatives exist for people with penicillin allergies. Most people start feeling noticeably better within two to three days of starting antibiotics, though you need to finish the full course to clear the infection and prevent complications like rheumatic fever.
Viral tonsillitis doesn’t respond to antibiotics. It resolves on its own, usually within 7 to 10 days. In the meantime, over-the-counter pain relievers, cold fluids, ice pops, and throat lozenges help manage the discomfort. Warm salt water gargles can soothe the irritation and help clear some of the surface debris from the tonsils.
Adults who get tonsillitis repeatedly, generally defined as several episodes per year over multiple years, may be candidates for tonsillectomy. Recovery from a tonsillectomy in adults is rougher than in children, typically involving 10 to 14 days of significant throat pain, but it eliminates the recurring infections.