A lymphoma lump is a swollen lymph node caused by the abnormal growth of white blood cells inside it. It typically feels like a firm, rubbery mass just under the skin, most often appearing in the neck, armpit, or groin. Unlike the tender, swollen glands you get with a cold or infection, a lymphoma lump is usually painless and doesn’t go away on its own within a few weeks.
How a Lymphoma Lump Feels
Lymph nodes are small, bean-shaped organs scattered throughout your body that filter fluid and help fight infection. Normally you can’t feel them. When lymphoma develops inside a node, it swells and becomes detectable as a lump under the skin. The lump is often described as firm or rubbery, smooth-surfaced, and easy to move slightly when pressed. It’s not squishy like a fat deposit or tender like an infected gland.
One of the most notable features is that lymphoma lumps are usually painless. That can actually work against early detection, since people tend to worry more about lumps that hurt. A painless lump that sticks around for weeks is, paradoxically, the one that deserves more attention.
Where Lymphoma Lumps Appear
The three most common locations are the neck, the armpits, and the groin, because these areas contain large clusters of lymph nodes close to the surface. Hodgkin lymphoma in particular tends to start in the neck or chest and spread in a predictable, orderly pattern to nearby node groups. Non-Hodgkin lymphoma can show up in those same spots but is more likely to appear in less typical locations or in multiple areas at once.
Lymph nodes deeper in the body, such as those in the chest or abdomen, can also be affected. You won’t feel those as a lump, but they can cause other symptoms like persistent coughing, chest pressure, or abdominal fullness depending on what structures they press against.
Other Symptoms That Can Accompany the Lump
A swollen node on its own doesn’t confirm lymphoma, but certain additional symptoms raise the concern significantly. Oncologists refer to these as “B symptoms,” and they include three specific findings: unexplained fevers above 100.4°F, drenching night sweats (the kind that soak through your bedclothes), and unexplained weight loss of more than 10% of your body weight over six months.
Persistent fatigue, itchy skin, and pain after drinking alcohol are also reported by some people with lymphoma, though these are less consistent and aren’t part of the formal B symptom criteria. The presence or absence of B symptoms matters for staging and treatment decisions once a diagnosis is made.
How It Differs From Other Lumps
Not every lump under the skin is a swollen lymph node, and not every swollen lymph node is lymphoma. Dana-Farber Cancer Institute notes that it’s impossible to determine whether a lymph node is cancerous just by touching it. Several other conditions produce similar-feeling lumps:
- Cysts are fluid-filled sacs under the skin. They’re often round, smooth, and may feel slightly soft or springy compared to the firmer texture of a swollen node.
- Lipomas are benign growths of fat tissue. They tend to be soft, doughy, and very movable, and they grow slowly over months or years without other symptoms.
- Infected lymph nodes swell during common illnesses like strep throat or ear infections. These are typically tender to the touch and shrink back to normal within one to two weeks as the infection clears.
The key distinguishing feature of a lymphoma lump isn’t how it feels in isolation. It’s the combination of painlessness, persistence beyond three to four weeks, and potentially accompanying systemic symptoms.
The Three-to-Four-Week Threshold
Lymph nodes swell for all sorts of routine reasons. A minor infection, a skin irritation, even a dental issue can cause a node to puff up temporarily. Guidelines from the American Academy of Family Physicians suggest that a three-to-four-week observation period is reasonable when a swollen node has an obvious benign explanation and no other concerning features.
If the node persists beyond that window, continues to grow, or is accompanied by B symptoms, weight loss, or risk factors for cancer, further evaluation is recommended. Nodes that appear in unusual locations (like above the collarbone) or that feel very hard and fixed in place rather than movable also warrant earlier investigation.
How a Lymphoma Lump Is Diagnosed
The only definitive way to determine whether a lump is lymphoma is through a biopsy, where tissue is removed and examined under a microscope. The type of biopsy matters significantly. A fine needle aspiration, where a thin needle draws out a small sample of cells, often isn’t enough. Diagnosing lymphoma requires pathologists to see the overall architecture of the tissue, meaning how the cells are organized within the node, not just what individual cells look like.
For this reason, a surgical excisional biopsy (removing the entire node or a large portion of it) is the preferred approach. Data from the American Society of Hematology show that excisional biopsy achieves a definitive diagnosis 98.1% of the time, compared to 92.3% for needle core biopsy. The gap is even wider for certain subtypes. One form of Hodgkin lymphoma was diagnosed less than half as often on needle biopsy compared to surgical excision, because the telltale tissue patterns simply weren’t visible in the smaller sample.
Before a biopsy, your doctor will likely start with a physical exam and blood work, possibly followed by imaging such as a CT scan or PET scan to see whether other nodes are enlarged. These steps help determine how urgently a biopsy is needed and where to sample from.
What Happens After Diagnosis
If a biopsy confirms lymphoma, the next step is staging, which maps how far the disease has spread. This typically involves additional imaging and sometimes a bone marrow biopsy. Lymphoma is broadly divided into two categories: Hodgkin lymphoma, which tends to spread in a sequential pattern from one node group to the next, and non-Hodgkin lymphoma, a larger and more varied family of cancers that can behave very differently depending on the specific subtype.
Treatment varies widely based on the type and stage. Some slow-growing non-Hodgkin lymphomas are monitored without immediate treatment, a strategy called watchful waiting. More aggressive forms require prompt therapy. Hodgkin lymphoma has particularly high cure rates even at advanced stages. The treatment experience, timeline, and outlook all depend heavily on the specific diagnosis, which is why getting an adequate tissue sample from the start is so important.