Your neck contains roughly 300 lymph nodes, making it one of the most lymph-node-dense areas in your body. Clinicians organize them into numbered levels (I through VI) based on their position relative to muscles, bones, and blood vessels. Each group filters fluid from a specific part of your head, mouth, or throat, which is why the location of a swollen node often points to the source of a problem.
The Six Levels of Neck Lymph Nodes
The standard classification divides the neck into six levels, some with sublevel divisions. Here’s where each group sits and what it drains.
Level I: Under the chin and jaw. These nodes sit above the hyoid bone (the small bone in your upper throat) and below the floor of your mouth. Level IA nodes, called submental nodes, cluster between the two front muscles under your chin. They drain the skin of your chin, your mid-lower lip, the tip of your tongue, and the front floor of your mouth. Level IB nodes, the submandibular group, sit just behind and to the side, tucked near your submandibular salivary gland. They receive drainage from the nasal cavity, the palate, the cheeks, both lips, and most of the front of the tongue.
Level II: Upper part of the neck, along the jugular vein. These run from the base of the skull down to the level of the hyoid bone, deep to the large sternocleidomastoid (SCM) muscle that angles across each side of your neck. Level IIA nodes sit close to the internal jugular vein, while Level IIB nodes lie just behind it, separated by a thin layer of fat. This is a common area for nodes to swell with throat infections because they filter drainage from the tonsils, upper throat, and back of the tongue.
Level III: Mid-neck. These nodes continue along the jugular chain, from the hyoid bone down to the level of the cricoid cartilage (the ring you can feel at the base of your voice box). They sit lateral to the carotid artery and filter lymph flowing down from levels I and II.
Level IV: Lower neck. Picking up where Level III ends, these nodes extend from the cricoid cartilage down to the collarbone. They drain the lower throat, thyroid region, and upper esophagus, and they also receive lymph cascading down from the levels above.
Level V: Back of the neck. This chain runs along the back triangle of the neck, behind the SCM muscle and in front of the trapezius, from the skull base to the collarbone. The upper portion (VA) tends to receive drainage from the scalp and the back of the head, while the lower portion (VB) connects with drainage from the lower neck and supraclavicular area.
Level VI: Front and center of the neck. These nodes sit in the central compartment between the two carotid arteries, in front of the windpipe and around the thyroid gland. They drain the thyroid, the voice box, and the upper trachea. You rarely feel these from the outside because they sit deep to other structures.
Supraclavicular Nodes: A Special Category
The nodes just above each collarbone deserve extra attention. A swollen left supraclavicular node, sometimes called Virchow’s node, is a classic sign of a process originating in the abdomen, because lymph from the abdominal organs travels upward through the thoracic duct and empties near this spot. A swollen right supraclavicular node more often points to something in the chest. These nodes are not commonly enlarged by routine infections, so persistent swelling here typically warrants prompt evaluation.
What You Can Actually Feel
Most normal lymph nodes in the neck are small, soft, and impossible to feel through the skin. The ones you’re most likely to notice when they swell are the Level I nodes under the jaw, the Level II nodes just below the ear along the SCM muscle, and the Level V nodes in the back triangle of the neck. When checking, use gentle circular pressure with your fingertips rather than poking. Two structures commonly mistaken for lymph nodes are the submandibular salivary glands (which feel like soft lumps under the jaw) and the carotid artery bulb (which pulses).
Normal Size vs. Swollen
Neck lymph nodes are typically less than 1 cm (about the width of a pencil eraser) measured across their short axis. A node between 1 and 1.5 cm is considered borderline, and anything over 1.5 cm is more clearly abnormal. These thresholds involve trade-offs: using 1 cm as the cutoff catches about 88% of abnormal nodes but also flags many normal ones, while using 1.5 cm misses nearly half of truly abnormal nodes but is much more specific when it does flag one. Size alone doesn’t tell the whole story, though. Shape, texture, and how the node changes over time all matter.
Why Neck Nodes Swell
The most common trigger is a routine upper respiratory infection, like a cold or the flu. Because your neck nodes filter drainage from your entire head and throat, almost any infection in those areas can make them enlarge. Strep throat, ear infections, sinus infections, dental abscesses, mono (caused by Epstein-Barr virus), and skin infections like staph are all frequent culprits. Less common causes include cat-scratch disease, Lyme disease, tuberculosis, and toxoplasmosis.
Most swollen nodes from infections are tender, soft, and mobile under the skin. They feel like small grapes or peas that slide when you press them. In viral infections specifically, the nodes tend to be swollen on both sides of the neck, clearly defined, and not particularly painful.
Characteristics That Raise Concern
Nodes that are hard, painless, and fixed in place (they don’t move when you push on them) carry a higher likelihood of something more serious, such as a malignancy or a granulomatous disease like sarcoidosis. Lymphoma nodes tend to feel firm, rubbery, and well-defined. A node that keeps growing over several weeks without an obvious infection, or one that appears in the supraclavicular area, is worth getting checked.
Tender, sore nodes are less worrisome. Tenderness usually means the node is inflamed from fighting an active infection. Most infection-related swelling resolves on its own once the underlying illness clears, typically within a couple of weeks. If nodes remain swollen or continue growing after a few weeks without improvement, that’s a reasonable point to get an evaluation.
Why Location Matters
Because each level drains specific tissues, the location of a swollen node narrows down where a problem might be. Swollen nodes under the jaw (Level I) often point to a dental infection, a mouth sore, or a lip infection. Nodes high on the side of the neck (Level II) commonly react to tonsillitis, pharyngitis, or ear infections. Swollen nodes in the front central compartment (Level VI) raise questions about the thyroid or voice box. And as noted, supraclavicular swelling can signal disease in the chest or abdomen rather than the head and neck.
This drainage map is also why clinicians pay close attention to which specific node group is enlarged. A single swollen node under the chin after a cold sore on your lip is a very different finding than a cluster of hard, painless nodes in the lower neck that appeared without any infection. The anatomy of the neck’s lymphatic system turns each node group into a signpost pointing back toward its source.