What are the most common causes of an enlarged lymph node?

The overwhelming majority of swollen lymph nodes are caused by ordinary infection, not cancer. A sore throat, dental infection, ear or skin infection, or a viral illness will often make nearby nodes swell for a week or two and then settle. In Telangana and Andhra Pradesh, tuberculosis (TB) is a genuinely common cause of enlarged nodes, particularly in the neck, and needs specific testing. Less commonly, reactions to some medicines or autoimmune conditions cause node swelling. Lymphoma is far down this list — it is the "don't-miss" cause, not the usual one. The pattern that matters is a painless node that keeps growing or persists beyond three to four weeks. Read more on whether a swollen node is TB or lymphoma.

When is a swollen lymph node serious enough to see a doctor?

A useful rule: get a node reviewed if it is painless and persists beyond three to four weeks, is steadily growing, sits above the collarbone, appears at several sites at once, or comes with so-called B symptoms — unexplained fever, drenching night sweats or weight loss. A node like that needs a proper assessment and often a biopsy, rather than yet another course of antibiotics. By contrast, a small, tender node that appears with an obvious infection and shrinks within a couple of weeks is almost always harmless. When in doubt, it is always reasonable to have it checked — see how long is too long for a swollen node.

How can I tell the difference between an infection node and a lymphoma node?

No one can tell for certain by feel alone, but there are useful clues. Infection-related nodes are usually tender, soft and mobile, appear alongside an obvious illness, and shrink within one to three weeks. Nodes that raise concern for lymphoma tend to be painless, firm or rubbery, and keep enlarging over weeks, sometimes with B symptoms. Location matters too: a node above the collarbone (supraclavicular) always warrants prompt review. Feel is only a guide, though — the only way to be sure is examination and, where needed, imaging and a biopsy of the whole node. Our page on whether lymphoma lumps are hard, soft or movable goes into more detail, and separating infection from red flags walks through the decision.

What are B symptoms and why do they matter?

"B symptoms" is the medical term for three specific whole-body symptoms that carry weight when someone has an enlarged node: unexplained fever, drenching night sweats (soaking the sheets or nightclothes), and unexplained weight loss of more than about 10% of body weight over six months. On their own, each has many benign causes — but when they occur together with a persistent, painless, growing node, they raise the priority for investigation and are formally recorded when lymphoma is staged, per NCCN and ESMO guidance. If you have a lasting node plus any of these, seek review promptly. See our pages on drenching night sweats, persistent fever and unexplained weight loss.

Which tests are done to find out why a lymph node is swollen?

Assessment starts with a careful history and examination, often followed by blood tests and an ultrasound of the node. If infection or TB is likely, targeted tests are done first — in our region TB testing is important. If a node stays suspicious, the definitive step is a biopsy. For suspected lymphoma an excision biopsy (removing the whole node) is preferred over a fine-needle sample, because the tumour's architecture must be seen to diagnose and subtype it. Tissue is then examined for markers such as CD20 and CD30 and, where relevant, cell-of-origin. A PET-CT or CT may follow to map the extent. CION delivers biopsy, bone-marrow examination and staging imaging directly. Learn more on the Lymphoma Treatment in Hyderabad page.

My swollen node turned out not to be cancer — should I still be relieved but cautious?

Yes — and that is the common, reassuring outcome. Most people investigated for a persistent node do not have lymphoma; infection, including TB in our region, or a reactive cause is found far more often. If your evaluation is clear, you can be genuinely reassured. It is still sensible to keep the follow-up your doctor suggests, complete any treatment (a full TB course, for example), and return if a node grows again, new nodes appear, or B symptoms develop. Being checked is never an over-reaction: the goal is simply to catch the rare serious cause early while confirming the far more likely harmless one. If you would value a second look, CION offers a free specialist review.

How treatable is lymphoma if a node does turn out to be lymphoma?

Lymphoma is among the more treatable cancers, and many types are potentially curable — which is exactly why catching a suspicious node early matters. Outcomes vary widely by type, stage and individual factors, so figures are general guides only. In published series, Hodgkin lymphoma has roughly 80–90% long-term survival, and the common aggressive non-Hodgkin type (diffuse large B-cell lymphoma) around 60–70%, per data referenced in NCCN and ESMO guidelines; slow-growing lymphomas are often managed for many years. These numbers vary by individual. Treatment is tailored to the exact subtype and may include chemotherapy, antibody (immunotherapy) and targeted therapy, and radiation — delivered directly at CION, with transplant or cellular therapy coordinated through accredited partners only if needed. Details are on the Lymphoma Treatment page.