Hodgkin’s lymphoma most often looks like a painless, firm lump under the skin, typically on the side of the neck, in the armpit, or near the groin. These lumps are swollen lymph nodes, and they’re the most common first sign of the disease. Unlike the tender, squishy lymph nodes that swell when you’re fighting a cold, cancerous nodes tend to feel rubbery and don’t go away after a few weeks.
Where the Lumps Usually Appear
Hodgkin’s lymphoma typically starts in the lymph nodes above the diaphragm, particularly in the neck or chest cavity. The neck is the single most common location, and many people first notice a lump along the side of the neck or just above the collarbone. Nodes under the arms and in the groin are the next most frequent sites. Less commonly, the disease starts in lymph nodes in the abdomen or pelvis, where you wouldn’t be able to see or feel them at all.
One characteristic pattern of Hodgkin’s lymphoma is that it tends to spread in a predictable, orderly way from one group of lymph nodes to a neighboring group. This is different from non-Hodgkin lymphoma, which more often shows up in scattered locations throughout the body or outside the lymph nodes entirely.
What the Lumps Feel Like
A swollen lymph node caused by Hodgkin’s lymphoma is usually painless, which is one reason people sometimes ignore it. The lump feels firm or rubbery, not soft, and it’s generally movable under the skin rather than fixed in place. Normal lymph nodes are about the size of a pea and rarely noticeable. Nodes that reach 1 centimeter or larger in diameter start to raise clinical concern, and Hodgkin’s nodes can grow considerably beyond that. Some people develop clusters of enlarged nodes that create a visible bulge, particularly in the neck.
Occasionally, the swollen nodes do cause a dull ache, and some people report that the lumps become painful after drinking alcohol. That’s an unusual but well-known quirk of Hodgkin’s lymphoma specifically.
Signs You Can’t See From the Outside
When Hodgkin’s lymphoma develops in the chest, which is common, the enlarged nodes form a mass in the area between the lungs called the mediastinum. You can’t see or feel this from the outside, but it can cause a persistent cough, chest pressure, or shortness of breath. On imaging scans, these masses light up brightly because the cancer cells are highly metabolically active. A mass is considered “bulky” when it exceeds 10 centimeters in diameter or takes up more than a third of the chest width on imaging, which affects treatment planning.
PET/CT scans are the primary tool doctors use to see the full picture of the disease inside the body. Hodgkin’s lymphoma absorbs the radioactive tracer used in PET scans very reliably, making it relatively straightforward to spot on imaging compared to some other cancers.
What It Looks Like Under a Microscope
The defining visual feature of Hodgkin’s lymphoma is a specific abnormal cell called a Reed-Sternberg cell. These cells are much larger than normal lymph node cells and contain two or more nuclei. Under a microscope, the classic Reed-Sternberg cell looks strikingly like a pair of owl eyes, with two large, round nuclei staring back at the viewer. If a pathologist sees these cells in a biopsy sample, the lymphoma is classified as Hodgkin’s. If they’re absent, it’s classified as non-Hodgkin’s.
Several variations of these cells exist. Some have a single nucleus rather than two. Others contain many small lobes with pale fluid inside, giving them a washed-out appearance. A type called “mummified cells” has unusually thick internal fluid and reddish-colored nuclei. The specific mix of cell types helps pathologists determine the exact subtype of Hodgkin’s lymphoma, which influences treatment.
Skin Changes and Whole-Body Symptoms
Hodgkin’s lymphoma doesn’t typically produce a visible skin rash the way some other lymphomas do. However, many people develop persistent, sometimes intense itching across large areas of the body, often without any visible rash at all. When skin changes do occur, they may appear as dry, irritated patches. The itching can be severe enough to interfere with sleep and is thought to result from the immune system’s reaction to the cancer cells rather than the cancer directly affecting the skin.
Beyond what you can see and feel on the surface, Hodgkin’s lymphoma often produces a set of whole-body symptoms known as “B symptoms”: unexplained fevers, drenching night sweats (the kind that soak through your clothes and sheets), and significant unintentional weight loss. These symptoms reflect the body’s inflammatory response to the disease. Not everyone with Hodgkin’s lymphoma develops them, but their presence signals a more active or advanced case and changes how the disease is staged and treated.
How It Differs From Non-Hodgkin Lymphoma
Both Hodgkin’s and non-Hodgkin lymphoma can produce painless swollen lymph nodes, making them hard to tell apart based on appearance alone. The key differences are in the pattern and in the microscopic details. Hodgkin’s lymphoma tends to start in the neck or chest and spread to adjacent node groups in a sequential fashion. Non-Hodgkin lymphoma is more likely to appear in scattered locations and to involve organs outside the lymph nodes, such as the stomach, skin, or brain.
The only way to definitively distinguish the two is through a biopsy. Hodgkin’s lymphoma arises from a specific type of immune cell called a B lymphocyte, and its hallmark is the Reed-Sternberg cell. Non-Hodgkin lymphoma can arise from several different cell types and never produces Reed-Sternberg cells. This distinction matters because the two diseases respond to different treatments and have different outlooks.