Swollen Lymph Nodes: Symptoms, Causes, and When to Seek Care
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR: Swollen lymph nodes (also called swollen glands) usually signal a common viral or bacterial infection and shrink back down on their own. They are most common in the neck, under the chin, in the armpits, and in the groin. Cancer is a rare cause. Warm compresses and over-the-counter pain relief ease the discomfort. See a healthcare professional if the swelling lasts more than 2 to 4 weeks, keeps growing, feels hard or rubbery, or comes with fever, night sweats, or unexplained weight loss. Seek immediate medical care for trouble swallowing or breathing.
Quick Answer
What are swollen lymph nodes? Bean-shaped clusters of immune cells that enlarge, often to pea or kidney-bean size, when fighting infection.
Most common cause — a viral or bacterial infection such as a cold, sore throat, or ear infection; cancer is a rare cause.
Common locations — neck, under the chin, armpits, and groin.
Do they go away? Usually yes; most viral swelling fades on its own, and antibiotics do not help viruses.
Home care — warm compresses and OTC pain relievers such as ibuprofen, naproxen, or acetaminophen; never give aspirin to children or teenagers.
When to see a doctor — swelling with no known reason, lasting 2–4 weeks or more, growing, hard or rubbery, or paired with fever, night sweats, or weight loss.
Emergency — get immediate care for trouble swallowing or breathing.
What Are Swollen Lymph Nodes, Exactly?
Lymph nodes, also called lymph glands, are small, round or bean-shaped bunches of cells packed with immune system cells. They act as filters for lymph fluid — the fluid that travels through the lymph system. As fluid passes through, lymph nodes trap viruses, bacteria, and other causes of illness before they can infect other parts of the body.
Lymph nodes are spread throughout the body in groups, and each group drains a specific area. This is why the location of the swelling can be a clue to its cause. The most common places to notice swelling are the neck, under the chin, the armpits, and the groin.
What Are the Symptoms of Swollen Lymph Nodes?
Swollen lymph nodes are a sign that something is wrong somewhere in the body. The nodes themselves might also feel tender and painful. The swelling can be the size of a pea or kidney bean, or larger.
Other symptoms depend on the underlying cause:
Runny nose, sore throat, or cough — common infections such as a cold
Swollen nodes all through the body — infection such as HIV or mononucleosis, or an immune system condition such as lupus or rheumatoid arthritis
Hard, fast-growing nodes that don't move when pushed — lymphoma (cancer of the lymph system) or another cancer
Fever — infection or other underlying illness
Night sweats — infection or other underlying illness
When Should You See a Doctor for Swollen Lymph Nodes?
Many swollen lymph nodes return to their usual size once the condition causing them improves. That is the reassuring baseline. But specific situations call for a medical evaluation:
Have no known reason — there is no obvious illness around them
Keep getting bigger, or stay swollen 2–4 weeks — persistence suggests the cause needs checking
Feel hard or rubbery, or don't move when pushed — fixed, firm nodes are more concerning than soft, mobile ones
Come with fever, night sweats, or weight loss — these are systemic warning signs
Come with a cough that doesn't improve — a persistent cough alongside swelling needs evaluation
Are located in the armpit — armpit swelling specifically warrants a check
Emergency guidance: Seek immediate medical care if you have trouble swallowing or breathing.
What Causes Swollen Lymph Nodes?
The most common cause is an infection, usually viral — the common cold being the classic example. Sometimes no cause is ever found.
Common Infections
Strep throat — bacterial throat infection
Measles — viral infection
Ear infections — common in children
Infected tooth — dental source of drainage
Mononucleosis — often causes widespread node swelling
Skin or wound infections (such as cellulitis) — local swelling near the infected area
HIV — often causes generalized swelling across the body
Less Common Infections
Beyond the everyday infections, a handful of less common ones also cause node swelling: tuberculosis, certain sexually transmitted infections such as syphilis, toxoplasmosis (an infection from contact with the feces of an infected cat or from eating undercooked meat), and cat scratch fever (a bacterial infection from a cat scratch or bite).
Immune System Disorders
Chronic immune conditions can cause lymph nodes to stay swollen. Lupus is an ongoing disease that causes inflammation and can affect the joints, skin, kidneys, blood cells, heart, and lungs. Rheumatoid arthritis causes inflammation in the synovium — the tissue that lines the joints. Sarcoidosis causes tiny groups of inflammatory cells called granulomas to form, most often in the lungs and lymph nodes.
Cancers and Rare Causes
Cancer rarely causes swollen lymph nodes, but when it does, it is typically lymphoma (a cancer that starts in the lymph system), leukemia (a cancer of the body's blood-forming tissue, including bone marrow and the lymph system), or another cancer that has metastasized — spread — to the lymph nodes.
Rarely, certain medicines can also cause swelling, including the anti-seizure medicine phenytoin (Dilantin) and medicines that prevent malaria. Silicone breast implants can also cause swollen lymph nodes.
Who Is at Higher Risk of Swollen Lymph Nodes?
Because many conditions can cause swollen lymph nodes, the risk factors really track the risk of those underlying conditions:
Older age — aging increases the risk of infections, immune system disorders, and cancer
High-risk behaviors — unprotected sex and injecting illicit drugs raise the risk of HIV and other STIs
Weakened immune system — illness or immune-suppressing medicines increase infection risk
What Are the Possible Complications?
When an infection that causes swollen lymph nodes goes untreated, a collection of pus may form. These collections are called abscesses. Pus contains fluid, white blood cells, dead tissue, and bacteria or other invaders. An abscess might need to be drained and treated with an antibiotic.
How Are Swollen Lymph Nodes Diagnosed?
Finding the cause of swollen lymph nodes is a step-by-step process. There is no single definitive test — the answer emerges from combining several pieces of information:
Medical history — how the swelling started and what other symptoms are present
Physical exam — checking nodes just under the skin — where they are, how they feel, and how big, tender, and warm they are
Blood tests — a complete blood count (CBC) and other tests to look for the cause
Imaging studies — a chest X-ray or CT scan of the affected area; sometimes a mammogram
Lymph node biopsy — a sample from a lymph node — or the whole node — removed and studied in a lab
How Are Swollen Lymph Nodes Treated?
Treatment targets the cause, not the swelling itself. That is a key point: the approach changes entirely depending on what is behind it.
Viral infection — time and self-care; the swelling usually goes down after the virus passes. Antibiotics do not help viral infections.
Bacterial infection — antibiotics.
HIV infection — treatment for HIV.
Immune disorder (lupus, rheumatoid arthritis) — treatment that targets the underlying condition.
Cancer — treatment for the cancer — which may involve surgery, radiation, or chemotherapy.
What Self-Care Helps with Tender or Painful Nodes?
If your swollen lymph nodes are tender or painful, two simple steps can bring relief:
Apply a warm compress. Dip a washcloth in hot water, wring it out, and place it on the affected area.
Take an over-the-counter pain reliever such as ibuprofen (Advil, Motrin IB, others), naproxen sodium (Aleve), or acetaminophen (Tylenol, others).
Important for parents: Do not give children or teenagers aspirin. Aspirin has been linked to Reye's syndrome — a rare, life-threatening condition — in children and teenagers who have the flu or chickenpox.
How Do You Prepare for Your Appointment?
You will likely start by seeing your family healthcare professional. A little preparation makes the visit much more productive.
Before the appointment, make a list of your symptoms and when they started — every symptom since the nodes began to swell. Note any possible sources of infection: travel abroad, hiking in areas known to have ticks, eating undercooked meat, being scratched by a cat, or having high-risk sex or sex with a new partner. Bring key medical information, including other conditions you have and all medicines, vitamins, and supplements you take with their doses. And bring a list of questions.
What's causing my symptoms?
What are other possible causes?
What tests do I need?
Can I infect others? How can I lower the risk?
How can I prevent this from happening again?
Your healthcare professional will likely ask whether the nodes have grown over time, whether they are tender, what makes symptoms better or worse, and whether you have had regular cancer screenings such as mammograms. While you wait for the appointment, warm compresses and an over-the-counter pain reliever such as ibuprofen or acetaminophen can help if the nodes are painful.
Conclusion
Swollen lymph nodes are usually the body doing exactly what it should: a temporary, localized response to an everyday infection. The nodes in your neck, under your chin, in your armpits, or in your groin swell up, fight off the invader, and then settle back down — often with nothing more than a warm compress and time.
The sensible framing: most swollen lymph nodes are harmless and self-limiting, but a small set of warning signs deserves a timely medical look. Nodes that last 2 to 4 weeks, keep growing, feel hard or rubbery, or come with fever, night sweats, or weight loss are not the typical viral pattern. And trouble swallowing or breathing is an emergency, not a wait-and-see situation.
Your next step: Have you noticed a lump in your neck, armpit, or groin that hasn't gone away after a few weeks, or one that feels hard and doesn't move? Talk to a healthcare professional. A short exam — and a blood test when needed — usually provides quick answers and peace of mind.
Frequently Asked Questions
Are swollen lymph nodes a sign of cancer?
Rarely. Most swollen lymph nodes are caused by common viral or bacterial infections. Cancer — such as lymphoma, leukemia, or a cancer that has spread — is an uncommon cause. Hard, fast-growing nodes that don't move when pushed are more concerning and should be checked.
How long does a swollen lymph node stay swollen?
It depends on the cause. Nodes that swell from a common infection usually shrink back down as the illness passes. If a node has no known reason, keeps growing, or stays swollen for 2 to 4 weeks, see a healthcare professional.
Can a sore throat cause swollen lymph nodes?
Yes. Strep throat and other throat infections are among the most common causes. Nodes in the neck and under the chin often swell during throat infections because those node groups drain that area.
When should I worry about a swollen lymph node in my armpit?
Any swelling in the armpit is worth a professional check. Armpit nodes can swell from local skin infections, but they also drain the breast area, so evaluation is recommended.
How are swollen lymph nodes diagnosed?
Through a combination of medical history, a physical exam (checking location, size, tenderness, and warmth), blood tests such as a CBC, imaging like a chest X-ray or CT scan, and sometimes a lymph node biopsy sent to a lab.
Do antibiotics help swollen lymph nodes?
Only when the cause is bacterial. Antibiotics do not help viral infections, and viral swelling usually goes down on its own once the virus passes.
What is the fastest way to relieve a painful swollen lymph node?
A warm compress (a washcloth soaked in hot water, wrung out, and applied to the area) plus an over-the-counter pain reliever such as ibuprofen, naproxen, or acetaminophen. Never give aspirin to children or teenagers because of the link to Reye's syndrome.
Can an infected cat scratch cause swollen lymph nodes?
Yes. Cat scratch fever is a bacterial infection from a cat scratch or bite, and toxoplasmosis can come from contact with the feces of an infected cat or from undercooked meat — both are less common causes of swollen nodes.
References
Health information, not medical advice. This article is for general education and is not a substitute for professional diagnosis or treatment. Always consult a qualified healthcare provider about your own health, and seek emergency care for urgent symptoms.
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