Swollen lymph nodes are one of the most common reasons patients search online for medical answers — and one of the most anxiety-inducing. The reassuring truth: the vast majority of lymph node swellings are caused by ordinary infections and resolve within a few weeks. But there are specific patterns that warrant prompt specialist attention.
What Are Lymph Nodes?
Lymph nodes are small, bean-shaped structures that are part of your immune system. You have hundreds throughout your body, with clusters in your neck, armpits, groin, chest, and abdomen. They filter lymph fluid and help your body fight infection. When your immune system is active — fighting a cold, a throat infection, or even a minor cut — the nearby lymph nodes often enlarge as they work.
Benign Causes (Usually Nothing to Worry About)
The most common cause of swollen lymph nodes is a local infection. A swollen neck node after a sore throat, or a swollen groin node after a skin infection on your leg, is entirely expected. These nodes are typically tender to touch, appear suddenly, and shrink within 2–4 weeks as the infection resolves. Viral illnesses such as glandular fever (Epstein-Barr virus) can cause widespread lymph node swelling that takes 4–6 weeks to fully settle.
Warning Signs That Need Specialist Evaluation
Seek specialist review if any of the following apply: the swelling persists beyond two to three weeks without an obvious infection, the node is painless (infections usually cause tenderness; lymphoma often does not), the node is hard, rubbery, or fixed in place, you have swelling in multiple locations simultaneously — neck, armpits, and groin at the same time, you also experience unexplained weight loss, drenching night sweats, persistent fever, or extreme fatigue alongside the swelling, or the node is larger than 2 cm (roughly the size of a grape) and not shrinking.
Could It Be Lymphoma?
Lymphoma — a cancer of the lymphatic system — is one of the more common blood cancers, and swollen lymph nodes are often its earliest sign. The most important distinction is painless, persistent swelling, particularly in the neck or above the collarbone. Hodgkin lymphoma, which is highly treatable, most commonly presents in young adults with enlarged neck nodes. Non-Hodgkin lymphoma affects a wider age range and can present more subtly.
A lymphoma diagnosis cannot be made from an examination alone — it requires a biopsy, flow cytometry, and often molecular testing. But the investigation starts with recognising the pattern early.
What to Do If You're Concerned
If your lymph nodes have been swollen for more than two weeks with no clear infection, or if you have any of the warning signs above, do not wait. A haemato-oncologist can evaluate your lymph node pattern alongside your blood results and clinical history. If investigation is needed, early referral leads to earlier diagnosis — and in lymphoma, early-stage diagnosis dramatically improves outcomes.
You are not overreacting by seeking an expert opinion. A 30-minute consultation can either give you reassurance that everything is benign, or ensure you get the right investigation without delay. Either outcome is worth it.
If you are unsure whether your symptoms fit a concerning pattern, you can use the free symptom checker to describe what you are experiencing — it takes under 2 minutes and helps you decide whether to seek specialist review.