Yes, there are lymph nodes directly under your chin. They’re called submental lymph nodes, and they sit in the soft tissue between the chin and the top of the neck. If you’ve noticed a small lump or bump in that area, you’re likely feeling one of these nodes, especially if it’s swollen from fighting off an infection.
What These Lymph Nodes Do
The submental lymph nodes filter fluid from a specific set of nearby structures: the center of your lower lip, the floor of your mouth, and the tip of your tongue. When bacteria, viruses, or other threats enter through these areas, the submental nodes trap and help destroy them. That’s why a cold sore on your lip, a mouth infection, or a dental problem can cause a noticeable bump right under your chin.
They’re not the only lymph nodes in the area. A separate group called submandibular lymph nodes sits slightly further back, tucked under the jawbone on each side. You typically have three to six of these per side, and they drain the cheeks, gums, side of the nose, and upper lip. Because the two groups are so close together, it can be hard to tell which set is swollen just by touch.
Why They Swell
The most common reason for a swollen lymph node under your chin is an infection, usually something routine. Upper respiratory infections like colds and the flu are the leading cause. Strep throat, sinus infections, ear infections, and infected teeth also trigger swelling in this area. The node enlarges because it’s producing extra immune cells to fight off whatever’s causing the problem.
Less commonly, swollen nodes can be tied to more serious infections like mononucleosis, HIV, or tuberculosis. Autoimmune conditions such as lupus, rheumatoid arthritis, or Sjögren’s syndrome can also cause persistent lymph node enlargement. In rare cases, a swollen node that doesn’t go away may signal a malignancy.
Normal Size vs. Something Worth Checking
Healthy lymph nodes are usually too small to notice. You might feel them as soft, pea-sized bumps if you press firmly into the tissue under your chin, but they generally don’t draw attention. When they swell in response to infection, they can grow to the size of a marble or larger and become tender to the touch.
In medical imaging, nodes are typically considered enlarged when their shortest dimension exceeds about 10 millimeters (roughly the width of a pencil eraser). But size alone isn’t the whole picture. Nodes smaller than 10 mm can still be abnormal, and nodes slightly above that threshold can be perfectly healthy and just reactive. Doctors look at a combination of features rather than relying on size as a single cutoff.
Features That Suggest a Problem
Most swollen lymph nodes under the chin are harmless and shrink back to normal within a couple of weeks as the underlying infection clears. Certain characteristics, however, raise more concern.
Nodes that are painless, very firm or hard, and fixed in place (meaning they don’t slide around when you push on them) are more likely to need evaluation. Rapid growth over days or weeks, especially without any obvious infection, is another signal worth paying attention to. On ultrasound, features like a round shape instead of an oval one, a missing bright center (which healthy nodes normally have), and unusual blood flow patterns are markers that doctors use to distinguish reactive nodes from potentially malignant ones.
A node that persists for more than two weeks without shrinking, continues to grow, or is accompanied by unexplained weight loss, night sweats, or fever deserves a closer look. Your doctor may order an ultrasound as a first step, since it can evaluate the node’s shape, internal structure, and blood flow without any radiation. If the ultrasound findings are inconclusive, a fine-needle aspiration (a quick procedure where a thin needle draws out a small sample of cells) can provide a definitive answer.
What Swollen Nodes Feel Like
When a submental node swells from an infection, it’s usually tender, slightly squishy, and movable under the skin. You might notice it while rubbing your chin, shaving, or looking down. It can feel like a small marble that shifts when you press on it. Some people also notice mild soreness in the area when swallowing or turning their head.
If you’re dealing with a cold, sore throat, or dental issue and feel a lump under your chin, the two are almost certainly connected. Treat the underlying infection, and the node will typically return to its normal size within one to three weeks. Nodes that swell from a minor infection and then resolve completely are doing exactly what they’re designed to do.