Adenoids are small mounds of soft, pinkish tissue that sit high in the back of the nasal cavity, just above the roof of the mouth. You can’t see them by opening your mouth and looking in a mirror the way you can with tonsils. They’re hidden behind the nasal passage, which is why most people have no idea what they look like or that they even exist until a doctor mentions them.
Where Adenoids Sit and What They’re Made Of
Your adenoids rest on the back wall of the nasopharynx, the space directly behind your nose and above your soft palate. They’re made of lymphoid tissue, the same spongy, immune-rich material found in your lymph nodes. That tissue is packed with white blood cells, especially the type that help identify and fight off germs entering through your nose and mouth.
In their healthy state, adenoids look like a small, bumpy cushion of pale pink tissue with shallow folds and ridges on the surface. The texture is irregular, almost like the surface of a raspberry. Unlike a smooth muscle or a clean stretch of skin, lymphoid tissue has a lumpy, cobblestone-like quality even when it’s perfectly healthy. In young children, a normal set of adenoids is roughly the size of a pea to a small grape, though this varies quite a bit from child to child.
How Adenoids Differ From Tonsils
People often confuse adenoids with tonsils because the two are closely related. Both are clumps of lymphoid tissue, and both serve as part of the body’s first line of defense against inhaled or swallowed germs. But they look different and sit in completely different spots.
Your palatine tonsils (the ones commonly called “tonsils”) are two oval pads visible on either side of the back of your throat when you open your mouth wide. They’re easy to spot. Adenoids, by contrast, sit higher and farther back, tucked behind the nasal passage where they can’t be seen without special instruments. A doctor typically uses a thin, flexible camera threaded through the nose (a nasopharyngoscope) to get a direct look. Older methods include a small angled mirror held at the back of the throat or a lateral neck X-ray, but the camera gives the clearest, most accurate picture without any radiation.
How They Change With Age
Adenoids are not a permanent fixture. They grow most rapidly between ages 3 and 6, partly because the nasal cavity is still small relative to the tissue inside it. They remain most immunologically active between ages 4 and 10, doing the bulk of their germ-fighting work during the years when children are constantly exposed to new infections. After puberty, the tissue gradually shrinks. By adulthood, most people’s adenoids have shriveled to a thin, nearly invisible remnant, and in many adults the tissue is essentially gone.
This natural growth-and-shrink cycle explains why adenoid problems are overwhelmingly a childhood issue. A 4-year-old with large adenoids and a small nasal passage is far more likely to have blocked breathing than a teenager whose adenoids are already retreating.
What Enlarged Adenoids Look Like
When adenoids swell, they balloon outward from the back wall of the nasal passage and start to block the airway. Doctors grade the enlargement based on how much of the nasal opening (the choana) the tissue covers:
- Grade I: The tissue fills less than 25% of the airway. Breathing is unaffected.
- Grade II: The tissue fills up to about two-thirds of the vertical height of the nasal opening. Mild snoring or mouth breathing may appear.
- Grade III: The tissue fills nearly all of the opening but doesn’t completely seal it. Noticeable breathing difficulty, especially at night.
- Grade IV: Complete obstruction. The swollen tissue fully blocks the back of the nasal passage.
Visually, enlarged adenoids look like a puffy, rounded mass pressing into the airway. The color may shift from pale pink to a deeper red or purplish hue if the tissue is inflamed. On a lateral neck X-ray, enlarged adenoids appear as a soft-tissue shadow narrowing the air column behind the nose. Doctors calculate an adenoidal-nasopharyngeal ratio from the X-ray. A ratio above 0.80 corresponds to clinically significant enlargement in about 94% of cases.
What Infected or Inflamed Adenoids Look Like
When adenoids become infected (a condition called adenoiditis), the tissue swells noticeably and reddens. A thick, yellowish or greenish mucus discharge often drains down from the area, sometimes visible at the back of the throat. The surface folds of the tissue can become more pronounced, giving an exaggerated cobblestone appearance. In chronic cases, a sticky bacterial film called a biofilm may coat the tissue, making infections harder to clear and more likely to recur.
Children with adenoiditis typically breathe through their mouths, snore loudly, and may have a nasal quality to their voice. The swelling can also press against the opening of the eustachian tubes (the channels connecting the middle ear to the throat), leading to repeated ear infections or fluid buildup behind the eardrum.
How Doctors Get a Look at Them
Because adenoids hide behind the nasal passage, seeing them requires one of a few approaches. The most accurate is flexible nasopharyngoscopy: a slim, flexible camera passed gently through the nostril. It gives a direct, real-time view of the tissue, the eustachian tube openings, and any other obstructions like polyps or a deviated septum. It requires no radiation, no sedation, and carries very few risks. In children who won’t sit still for the scope, a lateral neck X-ray offers a reasonable alternative, though it’s less precise. During surgery, a rigid endoscope provides the clearest image of all, but that’s only used when the child is already under anesthesia for adenoid removal.
If you’ve been told your child has enlarged adenoids and you’re curious what the tissue actually looks like, ask the doctor if they captured any images during the scope exam. Many clinics save photos or short video clips, and seeing the tissue firsthand makes it much easier to understand the degree of blockage and why treatment has been recommended.