Yes, there are several groups of lymph nodes in the back of your neck. If you’ve felt a small, soft bump near your hairline or along the back of your neck, you’re likely feeling one of these nodes. They’re a normal part of your immune system and sit in predictable locations, filtering fluid from your scalp, the back of your head, and nearby skin.
Where Exactly They Sit
The lymph nodes at the back of your neck fall into three main groups, each in a slightly different spot:
- Occipital nodes sit at the base of your skull, right where your neck meets the back of your head. They run from behind the ear area toward the bony bump you can feel at the center back of your skull. These are the ones most people notice when they run their fingers along their hairline.
- Posterior cervical nodes form a chain that runs down the back and side of your neck, behind the large muscle that connects your ear to your collarbone. This chain extends from behind the ear down toward the shoulder area.
- Retroauricular (mastoid) nodes sit on the bone just behind your ear. While technically more “behind the ear” than “back of the neck,” people often feel these and assume they’re neck nodes.
Most of these nodes are small, typically under 1 centimeter (roughly the width of a pencil eraser). At that size, you may never notice them unless they swell.
What These Nodes Drain
Each group of lymph nodes filters fluid from a specific zone. The occipital nodes at the base of your skull drain the back of your scalp. The posterior cervical chain handles a broader area, collecting fluid from the side and back of the neck and portions of the scalp. The retroauricular nodes behind each ear filter the skin around the ear and the nearby scalp.
This drainage pattern matters because it tells you where the problem likely is when a node swells. A swollen occipital node, for example, usually points to something happening on the back of your scalp: a cut, a bug bite, a patch of irritated skin, or a mild infection.
Why They Swell
The most common reason for swollen lymph nodes in the neck is an upper respiratory infection, like a cold or flu. When your body fights off an infection, the nearby lymph nodes ramp up their immune activity and can double or triple in size within a day or two.
For nodes specifically at the back of the neck, common triggers include:
- Scalp infections or irritation: fungal infections, a cut or scrape on the scalp, or even a bad case of dandruff
- Ear infections that involve the skin behind or around the ear
- Viral infections: mono (caused by Epstein-Barr virus), rubella, and chickenpox are known to cause posterior cervical swelling
- Skin infections: staph infections, insect bites that become infected, or conditions like shingles affecting the scalp
- Cat-scratch disease and Lyme disease, if the scratch or tick bite happened on the head, neck, or upper back
In children especially, posterior cervical nodes swell frequently with routine viral illnesses and shrink back to normal within a couple of weeks.
Lymph Nodes vs. Other Lumps
Not every bump at the back of your neck is a lymph node. Cysts and fatty lumps (lipomas) can appear in the same area, and they feel different from swollen nodes.
A swollen lymph node is typically soft, has a rubbery texture, shifts slightly under your fingers when you press it, and may feel tender. It tends to appear quickly and resolve within days to weeks as the underlying infection clears. A cyst, by contrast, feels firmer and more perfectly round, stays fixed in place when you press on it, and usually isn’t painful. Cysts grow slowly and don’t go away on their own. Lipomas are soft and doughy, painless, and also tend to stay put for months or years without changing.
If a bump appeared recently, moves a little under your skin, and feels slightly sore, it’s most likely a reactive lymph node doing its job.
Normal Size vs. Concerning Size
Doctors generally consider a cervical lymph node enlarged when it measures more than 1 centimeter across its short axis, roughly the size of a large pea. Nodes under that size are common and usually insignificant. During an active infection, a node can temporarily swell to 2 centimeters or more and still be completely benign.
Size alone isn’t the whole picture, though. Nodes smaller than 1 centimeter can occasionally be abnormal, and nodes larger than 1 centimeter are benign the vast majority of the time. What matters more is the combination of size, texture, and behavior over time.
Features That Deserve Attention
Most swollen lymph nodes in the back of the neck are harmless and shrink on their own within two to three weeks. A reasonable observation period is three to four weeks. If a node hasn’t returned to normal in that window, it’s worth getting checked.
Certain characteristics raise concern more than size alone. Nodes associated with serious conditions like metastatic cancer tend to feel firm or hard, don’t move when pressed, and may seem stuck to surrounding tissue or clumped together. In contrast, nodes linked to lymphoma are often rubbery and mobile, which can make them harder to distinguish from infection-related swelling based on feel alone.
Other signals that warrant a medical evaluation sooner rather than later include: unexplained weight loss, drenching night sweats, persistent fevers, or a node that keeps growing over weeks rather than shrinking. Adults over 40 with a persistent neck node that doesn’t respond to antibiotics or doesn’t have an obvious infectious cause should be evaluated promptly. When needed, a fine-needle aspiration biopsy, a quick in-office procedure, can help identify what’s going on inside the node.
For the vast majority of people who feel a small, tender bump at the back of their neck, the answer is straightforward: you’ve found a lymph node, it’s reacting to something minor, and it will likely resolve on its own within a few weeks.