Lymphoma most commonly causes swelling in lymph nodes you can feel: the neck, armpits, and groin. These are the three sites where people typically first notice a lump. But lymphoma can also enlarge nodes deeper in the body, particularly in the chest and abdomen, where swelling produces different symptoms and is only detectable through imaging.
The Three Most Common Sites
The neck (cervical nodes), armpits (axillary nodes), and groin (inguinal nodes) are where lymphoma swelling is most often discovered. These nodes sit close to the skin’s surface, so even modest enlargement is noticeable as a visible or palpable lump. A lymph node is generally considered enlarged when it exceeds about 1 to 1.5 centimeters in diameter, roughly the size of a large pea or small grape.
Neck nodes are particularly common in Hodgkin lymphoma, which tends to start in the upper body. Non-Hodgkin lymphoma can appear in any of the three sites and is more likely to show up in multiple, non-connected areas at once. Hodgkin lymphoma typically spreads in a more orderly, predictable pattern from one node group to the next, while non-Hodgkin lymphoma may skip around, appearing in distant node groups simultaneously.
What Lymphoma Lumps Feel Like
Lymphoma nodes have a distinct physical character that sets them apart from the swollen glands you get with a cold or throat infection. They tend to feel smooth and rubbery, move easily under the skin when you press on them, and are usually painless. An infected lymph node, by contrast, is often tender, feels harder or more irregular, and typically shrinks back to normal once the infection clears.
Most lymphoma lumps don’t hurt. Discomfort can develop if a node grows large enough to press against a nearby nerve or other tissue, but pain is not a hallmark feature. Some people with Hodgkin lymphoma report an unusual symptom: pain in a swollen node after drinking alcohol. This is uncommon but distinctive enough that doctors consider it a meaningful clue.
Deep Nodes You Can’t Feel
Lymphoma frequently involves nodes inside the chest (the mediastinum, the area between your lungs) and the abdomen. You can’t feel these with your hands, so they announce themselves through pressure on surrounding organs.
Swollen nodes in the chest can cause:
- A persistent cough or wheezing that doesn’t respond to typical treatment
- Shortness of breath
- Difficulty swallowing
- Hoarseness
- High-pitched, noisy breathing
Enlarged abdominal nodes may produce a sense of fullness or bloating, abdominal pain, or loss of appetite. When lymphoma affects the spleen or liver, those organs can swell as well, contributing to the feeling of pressure or discomfort in the upper abdomen. In some cases, deep node involvement is the only sign of lymphoma, with no external lumps at all. This is one reason imaging plays such a critical role in diagnosis.
How Doctors Find Hidden Nodes
A physical exam can detect enlarged nodes near the surface, but its accuracy varies from doctor to doctor. For a complete picture, PET-CT scanning is the gold standard for most types of lymphoma. This imaging combines a CT scan with a tracer that highlights metabolically active cells, making it possible to identify cancerous nodes throughout the body, including ones too deep or too small to feel.
PET-CT is used both for initial staging (determining how far the disease has spread) and for tracking how well treatment is working. Certain slower-growing types of non-Hodgkin lymphoma, like small lymphocytic lymphoma or marginal zone lymphoma, are better assessed with CT alone because they don’t always light up reliably on PET. For most other forms, PET-CT provides the clearest map of involvement.
Symptoms That Accompany the Swelling
Swollen nodes are often just one piece of the picture. Lymphoma can trigger a specific set of whole-body symptoms known as B symptoms, which doctors track because they affect staging and prognosis:
- Unexplained fever above 100.4°F (38°C)
- Drenching night sweats severe enough to soak through bedclothes
- Unexplained weight loss of more than 10% of your body weight within six months
Other common complaints include persistent fatigue, chills, and itchy skin (especially in Hodgkin lymphoma). These additional symptoms don’t formally count as B symptoms in staging, but their presence or reappearance can signal that the disease is active or returning.
When Swelling Should Raise Concern
Swollen lymph nodes are extremely common and usually mean your immune system is doing its job against an infection. The key differences with lymphoma are persistence, painlessness, and progression. A node that swells during a cold and shrinks within a week or two is behaving normally.
MD Anderson Cancer Center recommends getting a node checked if it keeps growing or hasn’t resolved on its own within two weeks. Other features that warrant attention: a node that feels rubbery and painless rather than tender, swelling in multiple node groups at the same time, or any of the B symptoms listed above appearing alongside the lump. A definitive diagnosis requires a biopsy, where a sample of the node tissue is examined under a microscope to look for the abnormal cells specific to lymphoma.