Enlarged Lymph Nodes (Lymphadenopathy)
Swollen glands, most often the immune system fighting infection
Quick Facts
- Type: Immune system response
- Most common cause: Infection
- Common sites: Neck, armpit, groin
- Usual course: Often settle within weeks
Overview
Lymph nodes are small, bean-shaped glands found throughout the body, including the neck, armpits, and groin. They are part of the immune system and help filter fluid and trap germs and other foreign material. When the body fights an infection or deals with inflammation, nearby lymph nodes often swell as immune cells multiply, which is why people commonly notice swollen glands when they are unwell.
Enlarged lymph nodes, known medically as lymphadenopathy, are very common and most often harmless and temporary. In the large majority of cases they reflect a passing infection. Less often, persistent or widespread swelling can be a sign of a more serious condition, so it is useful to know which features are reassuring and which deserve medical attention.
Symptoms
Enlarged lymph nodes are usually felt as small lumps under the skin. Features that often accompany them include:
- Tender or sore swelling, especially with an infection
- Nodes that feel soft, movable, and rubbery
- Swelling in the neck, under the jaw, in the armpits, or in the groin
- Signs of the underlying cause, such as sore throat, cough, fever, or a nearby skin infection
Reassuring signs are nodes that are small, tender, movable, and settle within a few weeks. Features that need review include nodes that are hard, fixed, painless, steadily growing, or accompanied by fever, night sweats, or unexplained weight loss.
Causes
Most enlarged lymph nodes are due to infection, but there are other causes:
- Infections: Common viral illnesses, throat and ear infections, skin infections, dental infections, and conditions such as mononucleosis.
- Inflammatory and immune conditions: Diseases that cause widespread inflammation can enlarge nodes.
- Medications: Some drugs occasionally cause node swelling.
- Cancers: Less commonly, lymphomas, leukemia, or cancers that have spread can involve lymph nodes.
The location of the swollen node often points to where the problem is, since nodes drain the region near them.
Risk Factors
- Recent or ongoing infection nearby
- Conditions that weaken the immune system
- Certain medications
- Exposure to specific infections through travel or contact
- Older age, when persistent painless swelling deserves closer attention
Diagnosis
A clinician evaluates enlarged nodes through history and examination, adding tests when needed.
- Examination: Checking the size, number, location, tenderness, and texture of the nodes, and looking for a source such as an infection.
- Blood tests: May help identify infection or other conditions.
- Imaging: Ultrasound or CT can assess deeper or persistent nodes.
- Biopsy: Sampling a node may be advised if it is persistent, growing, or has worrying features, to determine the cause.
Treatment
Treatment is aimed at the underlying cause rather than the swelling itself.
- Infections: Many viral infections resolve on their own; bacterial infections may need antibiotics, after which the nodes usually shrink.
- Comfort measures: Warm compresses and over-the-counter pain relief can ease tenderness.
- Specific conditions: Inflammatory diseases or cancers are treated according to the diagnosis, often by a specialist.
- Monitoring: Nodes that are likely reactive may simply be watched to confirm they settle.
Most reactive nodes shrink over a few weeks once the trigger resolves.
Self-Care and Prevention
- Practice good hand hygiene to reduce infections
- Care promptly for skin wounds and dental problems
- Stay up to date with recommended vaccinations
- Use warm compresses and simple pain relief for tender nodes
- Monitor the swelling and seek review if it persists or grows
When to See a Doctor
See a healthcare provider if a swollen node lasts more than about two to four weeks, keeps growing, is hard or fixed in place, or is painless without an obvious cause. Also seek care if swelling comes with fever, night sweats, unexplained weight loss, or widespread swelling. Get urgent attention if a node is rapidly enlarging, the overlying skin is red and very painful, or there is difficulty breathing or swallowing.
Frequently Asked Questions
Are swollen lymph nodes a sign of something serious?
Usually not. Most enlarged lymph nodes are a normal immune response to a passing infection and settle within a few weeks. A small number reflect more serious conditions, which is why persistent, hard, painless, or growing nodes should be checked.
How long do swollen lymph nodes last?
Nodes that swell with an infection often start to shrink as you recover and usually return toward normal within a couple of weeks. Swelling lasting more than two to four weeks, or that keeps growing, should be evaluated by a doctor.
When should I worry about a swollen lymph node?
Be concerned if a node is hard, fixed in place, painless, steadily enlarging, or accompanied by fever, night sweats, or unexplained weight loss. Rapid enlargement, very red painful skin, or trouble breathing or swallowing need urgent care.
Can I treat swollen lymph nodes at home?
If they are due to a minor infection, warm compresses and over-the-counter pain relief can ease tenderness while the body recovers. Treatment really targets the underlying cause, so persistent or worrying swelling should be assessed by a clinician.
References
- Mayo Clinic. Swollen lymph nodes.
- MedlinePlus, U.S. National Library of Medicine. Swollen lymph nodes.
- American Academy of Family Physicians. Lymphadenopathy.