Medically reviewed by Edward Tavel, MD, Medical Director · Last reviewed 10 September 2026
Lymph nodes are small, bean-shaped glands scattered throughout the body — in the neck, under the arms, in the groin, the chest, and the abdomen — and they are a core part of the immune system. Their job is to filter fluid and trap germs, damaged cells, and other unwanted material so the body can clear it. When one or more of these glands grows larger than usual, the medical term is lymphadenopathy, which simply means swelling of the lymph nodes. It is one of the most common things a doctor examines, and in the great majority of cases it reflects the immune system doing exactly what it is supposed to do. Enlarged lymph nodes are usually a sign of a response, not a sign of something serious.
Infections are the leading cause. A cold, a sore throat, an ear infection, a dental issue, or a skin infection near the node can all make nearby glands swell as they fight off germs, which is why the nodes in your neck may feel tender and enlarged during a cold and shrink back down as you recover. Nodes that swell this way are called reactive, and reactive nodes are extremely common; inflammatory and autoimmune conditions and certain medications can produce the same effect. Most reactive nodes are soft, tender, movable, and settle within a few weeks. The pattern matters more than the swelling itself: nodes that stay enlarged for several weeks without an obvious cause, keep growing, feel hard or fixed in place, or come with unexplained weight loss, ongoing fevers, or night sweats are worth having a doctor evaluate. In a small number of cases persistent, painless enlargement can be linked to more serious conditions, including lymphoma, and only a physician can make that distinction.
Because lymph nodes are located throughout the body, a whole-body MRI can visualize enlarged nodes across several regions at once — neck, chest, abdomen, and pelvis — often as an incidental finding noticed while the scan reviews the body rather than as something it was specifically looking for. Whole-body MRI uses no ionizing radiation and no contrast dye, and it documents the size and location of nodes clearly, which is useful as a baseline that any future scan can be compared against. It is a screening tool and not a diagnosis, so the practical next step when an enlarged node appears on a report is to share it with your physician, who can weigh it against your symptoms and history. To learn more, see the conditions a whole-body scan can detect, explore the Whole Body MRI Scan in Charleston, or read how we explain incidental findings on an MRI.
Frequently asked questions
What does it mean if my lymph nodes are enlarged?
It usually means your immune system is responding to something, most often a nearby infection. Reactive nodes are typically soft, tender, and movable, and they often settle down within a few weeks once whatever prompted them has passed.
Are enlarged lymph nodes a sign of cancer?
Only rarely. The great majority are reactive and benign, caused by infection, inflammation, or a normal immune response. In a small number of cases, persistent painless enlargement can be linked to more serious conditions, which is why unexplained swelling should be evaluated by a doctor.
When should I see a doctor about swollen lymph nodes?
See a doctor if a node stays enlarged more than a few weeks without an obvious cause, keeps growing, feels hard or fixed in place, or comes with unexplained weight loss, ongoing fevers, or night sweats. This is a sensible next step for evaluation, not a reason to panic.
How does a whole-body MRI show enlarged lymph nodes?
Because lymph nodes are found throughout the body, a whole-body MRI can visualize enlarged nodes in several regions at once, often as an incidental finding. It uses no radiation and no contrast dye and documents a node’s size and location as a clear baseline.
What should I do if an enlarged node is noted on my scan?
Share the report with your primary-care physician or a specialist. A whole-body MRI can surface an enlarged node, but it does not replace evaluation by your doctor, who can weigh the finding against your symptoms and history. For most people, that conversation is reassuring.
Sources
A whole-body MRI at MRI Wellness looks at the brain, spine, chest, abdomen and pelvis in a single session, without radiation or contrast dye. No referral is needed.
