Lymphoma cancer
Persistent, painless swelling in the neck, armpit, or groin
A lump under the skin, usually painless, in the neck, armpit, or groin, that has been there for several weeks and is not shrinking. It may be soft or firm, and unlike an infection-related swollen node, it typically does not come with an obvious cause like a nearby cut or sore throat.
What it could mean
Painless, persistent lymph node swelling is one of the most common signs of Non-Hodgkin Lymphoma (NHL) or Hodgkin lymphoma. Lymphoma often shows up first as a node that grew for no clear reason and simply stayed enlarged, sometimes alongside fatigue, unexplained weight loss, night sweats, or itchy skin.
What it probably is (to be fair)
The overwhelming majority of swollen lymph nodes are your immune system doing its job, reacting to a cold, a minor infection, or a small skin injury nearby. These usually shrink within two to four weeks as the underlying cause resolves.
Why this gets dismissed
A swollen node gets waved off constantly, "you must be fighting something off," and most of the time that is exactly right. The distinction that actually matters is time: a node related to infection shrinks within a few weeks. One that does not shrink, or keeps growing, deserves an actual look, not another few weeks of watching.
This gets missed most often in people who otherwise feel fine. Lymphoma frequently does not come with pain or an obvious sick feeling early on, which is exactly why "I feel fine so it is nothing" is not a reliable filter here.
When to call your doctor
- A lymph node swollen for more than 4 weeks with no clear infection to explain it
- A node that keeps growing rather than shrinking
- Swollen nodes in more than one area at once (neck and armpit, for example)
- Unexplained fevers, drenching night sweats, or weight loss alongside the swelling
- Persistent itchy skin with no rash or clear cause, paired with node swelling
- Unusual fatigue that does not improve with rest
When to go to the ER
- Rapid, painful swelling of a node with high fever (possible serious infection needing urgent care)
- Difficulty breathing or swallowing alongside neck swelling
If you're dismissed
Ask directly: "This node has not gone down in over a month, can we get an ultrasound, and if it is still enlarged, a referral for a biopsy?" A node that persists past 4-6 weeks without explanation is a reasonable, standard reason to ask for imaging, not an overreaction.