A normal lymph node is small, soft, and usually impossible to feel. If you can feel a distinct, pea-sized or larger bump under your skin in your neck, armpits, or groin, it’s likely a swollen lymph node. Most of the time, this means your immune system is actively fighting off an infection nearby. Here’s how to check, what you’re feeling for, and what the different findings mean.
Where to Check and How to Do It
Lymph nodes cluster in predictable spots: along the sides and back of your neck, under your jaw, behind your ears, in your armpits, and in your groin creases. To check them, use the pads of your index and middle fingers (not your fingertips) and press gently in a slow, circular motion. You’re feeling for small, rounded bumps just beneath the skin. Don’t press too hard or you’ll push right past them.
Always compare both sides. A swollen node on one side of your neck with nothing matching on the other side is more clinically meaningful than symmetrical bumps. In the groin, nodes are naturally a bit larger than elsewhere. A normal inguinal (groin) lymph node is roughly a quarter inch wide, and doctors generally consider one enlarged when it exceeds half an inch. Neck and armpit nodes follow similar thresholds, though they’re typically smaller at baseline.
One common mistake is confusing other structures for lymph nodes. In the neck, the carotid artery has a pulsing bulge you can feel near the jaw, and the salivary glands sit in similar territory. A pulse rules out a lymph node. Salivary glands feel more diffuse and sit right below the jawbone on both sides. Cysts, lipomas (fatty lumps), and thyroid nodules can also create bumps in the neck that mimic swollen nodes. If a lump doesn’t move at all when you press it, or feels like it’s attached to deeper tissue, it may not be a lymph node.
What a Swollen Node Feels Like
When a lymph node swells from a common infection, it typically feels like a soft, movable, marble-sized bump. It often hurts when you press on it, and the skin over it may feel warm. That tenderness is actually a reassuring sign. It means your immune system is responding to something, usually a cold, sore throat, skin infection, or dental issue. Bacteria like strep and staph are among the most common triggers, and the swollen nodes almost always appear near the infection site: a throat infection swells the neck nodes, a cut on your hand swells the armpit nodes, and a foot infection swells the groin nodes.
A node that feels firm or rubbery, doesn’t hurt, and doesn’t slide easily under your fingers is a different story. Hard, fixed nodes that seem stuck in place and grow steadily over weeks raise more concern. These characteristics are associated with cancers like lymphoma or with cancer that has spread from another site. That said, touch alone is not a reliable diagnostic tool. Research on palpation shows it catches only about 40% of confirmed cancerous nodes, because small malignant nodes can feel completely normal and large infected nodes can feel alarming. The texture and behavior of a node are clues, not answers.
Common Causes of Swelling
The vast majority of swollen lymph nodes trace back to infections. Upper respiratory viruses, strep throat, ear infections, mononucleosis, and skin wounds are the most frequent culprits. Cat scratch disease, caused by a bacterial infection from a cat’s scratch or bite, is a classic cause of a single dramatically swollen node near the injury. Dental abscesses commonly swell the nodes under the jaw.
Less commonly, autoimmune conditions like lupus or rheumatoid arthritis cause widespread node swelling on both sides of the body. Certain medications can also trigger it. When nodes swell in multiple regions at once (neck, armpits, and groin simultaneously), the cause is more likely systemic, meaning something affecting the whole body rather than a local infection.
Signs That Deserve Attention
Several features shift a swollen node from “probably fine” to “worth getting checked.” The location matters. Nodes above the collarbone (the supraclavicular area) are considered a red flag regardless of size or texture, because this spot rarely swells from routine infections. Risk factors for a more serious cause include being over 40, and having nodes that have been growing for more than three to four weeks without an obvious infection.
Pay attention to what else is happening in your body. Three specific systemic symptoms, sometimes called “B symptoms,” are closely linked to lymphomas and warrant prompt evaluation:
- Unexplained weight loss of more than 10% of your body weight
- Drenching night sweats that soak your clothes or sheets
- Persistent fevers without an identifiable infection
Any one of these alongside a swollen node changes the clinical picture significantly. Nodes that keep enlarging over weeks, or that feel hard and immovable, also fall into this category.
The Typical Timeline
Infection-related swelling usually peaks within a few days and resolves within two to three weeks as the infection clears. It’s normal for a node to stay slightly enlarged for a bit longer, especially after a significant infection like mono. You may notice a small, painless, movable node in your neck or groin that seems to persist indefinitely. These “shotty” nodes are common, harmless remnants of past infections.
Clinical guidelines suggest that unexplained node swelling lasting three to four weeks, with no clear infectious cause and no sign of shrinking, is the threshold for further evaluation. At that point, a doctor would typically order imaging (usually an ultrasound) to examine the node’s internal structure. On ultrasound, benign nodes have an oval shape, sharp borders, and a bright center called a hilum where blood vessels enter. Concerning nodes tend to be rounder, have blurred edges, and show chaotic blood flow patterns. If imaging raises questions, a biopsy provides a definitive answer.
What You Can Do Right Now
If you’ve found a tender, soft, movable bump during or shortly after an illness, you’re almost certainly feeling your immune system at work. Warm compresses and over-the-counter pain relievers can help with discomfort while the underlying infection resolves. Keep track of the node’s size. If it’s shrinking over the course of a week or two, that’s a good sign.
If the node is painless, hard, fixed in place, larger than one inch, located above your collarbone, or still growing after three to four weeks, those features warrant a medical evaluation. The same applies if you’re experiencing unexplained weight loss, night sweats, or persistent fevers alongside the swelling. Identifying these patterns early gives you a clear framework for deciding whether what you’re feeling is routine or something that needs a closer look.