Swollen lymph nodes are a common symptom and are often linked to infections that settle on their own. However, persistent, enlarging or unexplained swollen lymph nodes should always be assessed to identify the underlying cause and determine whether further investigation is needed.

Important Medical Information

This article is intended for general educational purposes only and should not replace an individual consultation with a qualified healthcare professional.

Swollen lymph nodes are extremely common and, in many cases, are a normal response to your immune system fighting an infection. However, they can occasionally be associated with conditions that require medical assessment.

If you develop rapidly enlarging swelling together with severe difficulty breathing, difficulty swallowing, significant facial swelling or another suspected medical emergency, call 999 or attend your nearest Emergency Department immediately.

Quick Summary

If you only have one minute, here are the key points.

• Swollen lymph nodes are common and are usually caused by infections.
• Lymph nodes often become enlarged while your immune system is fighting bacteria or viruses.
• Most swollen lymph nodes improve within a few weeks.
• Persistent, enlarging or unexplained swollen lymph nodes should be assessed by a GP.
• Not everyone with swollen lymph nodes needs blood tests or scans.
• Your GP will decide whether further investigations are appropriate based on your symptoms and examination.
• In a small number of cases, swollen lymph nodes may require referral to a specialist.

At a Glance

Question	Answer
Are swollen lymph nodes common?	Yes. They are a frequent reason for visiting a GP.
Are they usually serious?	No. Most are related to common infections.
Should every swollen lymph node be investigated?	No. Assessment depends on size, duration, location and associated symptoms.
Do swollen lymph nodes always mean cancer?	No. Cancer is a much less common cause than infection.
Who should I see first?	A GP is usually the most appropriate first point of contact.

📌 Important to Remember

Swollen lymph nodes are a symptom, not a diagnosis.

An enlarged lymph node tells us that the immune system is responding to something. The important question is what is causing that response, not simply whether the lymph node is enlarged.

What Are Lymph Nodes?

Lymph nodes are small, bean-shaped structures that form part of the body’s immune system.

They act as biological filters, helping your body recognise and respond to infections and other conditions.

Although they are found throughout the body, lymph nodes are most commonly noticed in the:

• neck;
• under the jaw;
• armpits;
• groin;
• above the collarbone.

Many healthy people cannot normally feel their lymph nodes.

However, they may temporarily become larger while the immune system is responding to an infection.

Why Do Lymph Nodes Become Swollen?

When your immune system detects bacteria, viruses or other triggers, immune cells become active inside nearby lymph nodes.

As these cells multiply, the lymph node may temporarily increase in size.

This process is often a normal sign that the immune system is working as expected.

For example, swollen lymph nodes commonly develop after:

• a sore throat;
• a cold;
• tonsillitis;
• a dental infection;
• an ear infection;
• certain viral illnesses.

In these situations, the swelling usually improves gradually as the underlying illness settles.

Common Causes of Swollen Lymph Nodes

Possible cause	Usually serious?	GP assessment recommended?
Viral infection	Usually not	If symptoms persist
Bacterial infection	Usually not	Often appropriate
Dental infection	Usually not	Yes
Ear, nose or throat infection	Usually not	If symptoms continue
Skin infection	Usually not	Often appropriate
Autoimmune conditions	Sometimes	Yes
Medication reactions	Occasionally	Yes
Less common medical conditions	Sometimes	Yes

When Swollen Lymph Nodes Are Usually Not a Cause for Concern

In many people, swollen lymph nodes appear during or shortly after a common infection.

Typical examples include:

• a cold;
• influenza;
• COVID-19;
• tonsillitis;
• a throat infection;
• a tooth infection.

In these situations, the lymph nodes often feel:

• slightly enlarged;
• tender to touch;
• movable under the skin.

As the infection improves, the swelling usually reduces gradually over the following days or weeks.

A lymph node may remain slightly enlarged for some time after the infection has resolved, and this does not necessarily indicate an ongoing problem.

Why Understanding the Cause Matters

One of the biggest concerns for patients is whether a swollen lymph node automatically means something serious.

Fortunately, the answer is usually no.

However, swollen lymph nodes can develop for many different reasons.

Some require no treatment beyond monitoring.

Others may need medication, blood tests or, less commonly, further investigations.

For this reason, the aim of a GP consultation is not simply to confirm that a lymph node is enlarged, but to understand why it has become enlarged.

What Information Will Your GP Ask About?

During your appointment, your GP will usually ask questions such as:

• When did you first notice the swelling?
• Has it become larger over time?
• Is it painful?
• Have you recently had a cold, sore throat or dental problem?
• Have you experienced fever?
• Have you noticed unexplained weight loss?
• Have you had persistent night sweats?
• Are there swollen lymph nodes in more than one area?
• Have you recently travelled abroad?
• Are you taking any regular medication?

These answers often provide important clues before any investigations are considered.

Why You Should Avoid Self-Diagnosis

Searching online after finding a swollen lymph node can quickly become worrying.

Many people immediately fear cancer.

In reality, the vast majority of swollen lymph nodes seen in general practice are caused by common, non-serious conditions.

At the same time, persistent or unexplained swelling should not simply be ignored.

A GP assessment helps place the symptom into the context of your overall health, your medical history and any associated symptoms before deciding whether reassurance, treatment or further investigations are appropriate.

 

Common Causes of Swollen Lymph Nodes

Although swollen lymph nodes can be worrying, most cases seen by GPs are caused by common infections rather than serious illness.

The most important questions are:

• Where is the swollen lymph node?
• How long has it been present?
• Has it changed in size?
• Are there any other symptoms?

The answers help your GP decide whether the swelling is most likely to settle naturally or whether further assessment is appropriate.

Common Causes Compared

Possible cause	Typical features	Usually serious?
Viral infections	Cold, flu, sore throat	Usually not
Bacterial infections	Painful swelling, fever	Usually not
Dental infections	Swelling under the jaw	Usually not
Ear, nose and throat infections	Neck lymph nodes enlarge	Usually not
Skin infections	Swelling near the affected area	Usually not
Autoimmune conditions	Persistent or multiple enlarged lymph nodes	Sometimes
Medication reactions	Less common	Occasionally
Less common medical conditions	Persistent, unexplained swelling	Medical assessment recommended

Viral Infections

Viruses are the most common cause of swollen lymph nodes.

Your immune system responds by increasing the activity of nearby lymph nodes while fighting the infection.

This commonly occurs with:

• the common cold;
• influenza;
• COVID-19;
• glandular fever;
• other viral illnesses.

In these situations, the lymph nodes often become:

• slightly enlarged;
• tender;
• mobile under the skin.

As the infection improves, the swelling usually settles gradually over the following weeks.

Bacterial Infections

Bacterial infections can also cause lymph nodes to enlarge.

Examples include:

• tonsillitis;
• throat infections;
• infected teeth;
• gum infections;
• skin infections.

Unlike some viral infections, bacterial infections may require medical assessment and, in some cases, treatment.

Dental Problems

Many people are surprised to learn that a tooth infection or dental abscess can cause swollen lymph nodes beneath the jaw.

Symptoms may include:

• tooth pain;
• swollen gums;
• facial discomfort;
• tender lymph nodes under the jaw.

Treating the underlying dental problem usually allows the lymph node to return to normal.

Ear, Nose And Throat Infections

Because many lymph nodes are located in the neck, infections affecting the ears, nose or throat frequently cause swelling.

Examples include:

• tonsillitis;
• ear infections;
• sinus infections;
• throat infections.

This is one of the most common reasons why people notice enlarged lymph nodes in the neck.

Skin Infections

Lymph nodes often enlarge close to the site of a skin infection.

For example:

• an infected cut;
• an infected insect bite;
• cellulitis;
• infected eczema.

The enlarged lymph node is usually found near the affected area because it is helping the immune system respond to the infection.

Autoimmune Conditions

Less commonly, swollen lymph nodes may occur in people with autoimmune conditions.

Examples include:

• rheumatoid arthritis;
• lupus;
• other inflammatory disorders.

These conditions are considerably less common than infections and are assessed alongside your overall medical history and other symptoms.

Medication Reactions

Some medicines can occasionally cause enlarged lymph nodes.

Although this is uncommon, your GP will review:

• current medication;
• recent changes to treatment;
• new prescriptions;
• over-the-counter medicines.

This helps determine whether medication could be contributing to your symptoms.

Can Swollen Lymph Nodes Be Cancer?

This is understandably one of the first questions many people ask.

Fortunately, most swollen lymph nodes are not caused by cancer.

However, persistent or unexplained swelling should never be ignored.

Your GP will consider several factors, including:

• how long the lymph node has been enlarged;
• whether it is increasing in size;
• where it is located;
• whether it feels tender or painless;
• whether there are enlarged lymph nodes elsewhere;
• whether other symptoms are present.

If appropriate, further investigations may be recommended.

The purpose of these investigations is to identify the cause, not because cancer is automatically suspected.

Swollen Lymph Nodes In Different Parts Of The Body

The location of the swollen lymph node often provides useful diagnostic information.

Location	Common causes
Neck	Colds, sore throats, tonsillitis, dental infections
Under the jaw	Dental infections, throat infections
Armpit	Skin infections, arm infections, vaccinations and other causes
Groin	Skin infections affecting the legs or feet and other local causes
Above the collarbone	Always requires medical assessment

The location alone does not provide a diagnosis, but it helps your GP decide which causes are more likely.

What Happens During A GP Assessment?

A swollen lymph node is only one part of the overall clinical picture.

During your consultation, your GP will consider:

• your symptoms;
• medical history;
• recent infections;
• recent travel;
• medications;
• vaccinations;
• family history;
• lifestyle factors.

This information often provides important clues before investigations are considered.

Physical Examination

Your GP may examine:

• the size of the lymph node;
• whether it is tender;
• whether it moves under the skin;
• whether there are enlarged lymph nodes elsewhere;
• your throat;
• ears;
• mouth and teeth;
• skin;
• abdomen if clinically appropriate.

The examination helps determine whether monitoring, treatment or further investigation is the most appropriate next step.

When Might Blood Tests Be Helpful?

Blood tests are not routinely needed for every swollen lymph node.

However, depending on your symptoms, they may help investigate possible causes.

Examples include tests for:

• infection;
• inflammation;
• iron deficiency;
• anaemia;
• glandular fever;
• thyroid function;
• other medical conditions.

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When Might An Ultrasound Be Recommended?

Sometimes your GP may recommend an ultrasound scan.

Ultrasound can provide additional information about:

• the size of the lymph node;
• its appearance;
• whether further assessment is appropriate.

Importantly, not every swollen lymph node requires an ultrasound, and many people recover without any imaging.

Common Questions Patients Ask

Why is my lymph node still swollen after a cold?

Lymph nodes often remain enlarged for several weeks after an infection has resolved. This can be a normal part of the recovery process.

Can allergies cause swollen lymph nodes?

Allergies are not considered one of the most common causes. Your GP will assess your symptoms to determine whether another explanation is more likely.

Can stress cause swollen lymph nodes?

Stress itself is not generally considered a direct cause of swollen lymph nodes. However, it may affect how aware people become of physical symptoms.

Should I keep touching the swollen lymph node?

Repeatedly checking or pressing a lymph node may make it feel more tender and can increase anxiety. If you are concerned, it is better to arrange a medical assessment than repeatedly examine it yourself.

Myth vs Fact

Myth: Every swollen lymph node means cancer.

Fact: Most swollen lymph nodes seen in primary care are caused by infections or other non-serious conditions.

Myth: Antibiotics are always needed.

Fact: Many swollen lymph nodes are caused by viral infections, for which antibiotics are not effective.

Myth: Blood tests are always necessary.

Fact: Investigations are guided by your symptoms, examination and medical history.

Myth: A painless lymph node is always dangerous.

Fact: The cause cannot be determined by pain alone. Assessment depends on the overall clinical picture.

When Should You See a GP About Swollen Lymph Nodes?

Swollen lymph nodes are usually a temporary response to infection and often improve without any specific treatment.

However, if the swelling persists, increases in size or is not linked to an obvious infection, it should be assessed by a GP.

The aim of a medical assessment is not simply to confirm that a lymph node is enlarged, but to identify the underlying cause and determine whether further investigation or treatment is appropriate.

Early assessment can often provide reassurance, while also ensuring that conditions requiring medical attention are identified promptly.

When Should You Book a GP Appointment?

You should arrange a GP appointment if a swollen lymph node:

• remains enlarged for more than a few weeks;
• continues to increase in size;
• appears without an obvious infection;
• returns repeatedly;
• is present in more than one area of the body;
• is associated with persistent fever;
• is accompanied by unexplained weight loss;
• occurs together with persistent night sweats;
• becomes increasingly painful or inflamed;
• is causing concern, even if you feel otherwise well.

Seeking medical advice does not necessarily mean something serious is suspected. It allows your GP to assess the swelling in the context of your overall health and decide whether any further investigation is needed.

When Is It Usually Safe to Monitor at Home?

Many swollen lymph nodes can simply be monitored while the underlying infection settles.

This is often appropriate when:

Situation	What is usually appropriate
During or shortly after a cold	Monitor while symptoms improve
After a sore throat	Monitor if swelling gradually reduces
Following a minor viral illness	Monitor over the following weeks
After a dental infection already receiving treatment	Continue treatment and monitor recovery
Mild tenderness that is improving	Continue observation unless symptoms worsen

If the swelling does not gradually improve or new symptoms develop, you should arrange a medical review.

NHS 111, GP or 999: Which Service Should You Use?

Many patients are unsure which healthcare service is most appropriate.

GP (General Practitioner)

For most people, the GP should be the first healthcare professional to assess swollen lymph nodes.

Your GP can:

• examine the swollen lymph node;
• review your medical history;
• identify signs of infection;
• arrange blood tests if appropriate;
• request imaging when clinically indicated;
• refer you to a specialist if necessary.

NHS 111

NHS 111 can provide advice if you require urgent medical guidance but your symptoms are not life-threatening.

The service can advise whether you should:

• arrange a GP appointment;
• attend an urgent treatment centre;
• seek emergency assessment.

When Should You Call 999?

Swollen lymph nodes themselves rarely represent a medical emergency.

However, you should call 999 immediately if swelling occurs together with:

• severe difficulty breathing;
• difficulty swallowing saliva;
• rapidly progressing swelling of the face or neck;
• collapse or loss of consciousness;
• another suspected medical emergency.

These situations require immediate assessment regardless of the underlying cause.

What Happens During a GP Appointment?

Your GP will begin by taking a detailed medical history.

You may be asked questions such as:

• When did you first notice the swelling?
• Has it become larger?
• Is it painful?
• Have you recently had a cold, sore throat or dental infection?
• Have you travelled recently?
• Are you taking any medication?
• Have you noticed weight loss or night sweats?
• Do you have swollen lymph nodes anywhere else?

These answers often provide important clues before any investigations are considered.

Physical Examination

Your GP may examine:

• the size of the lymph node;
• whether it is firm or soft;
• whether it moves freely under the skin;
• whether it is tender;
• nearby lymph nodes;
• your mouth and throat;
• ears;
• skin;
• abdomen, if clinically appropriate.

The findings help determine whether reassurance, treatment or further investigations are the most appropriate next step.

What Tests Might Be Recommended?

Most swollen lymph nodes do not require extensive investigations.

However, depending on your symptoms and examination, your GP may recommend one or more of the following.

Blood Tests

Blood tests may help identify:

• signs of infection;
• inflammation;
• anaemia;
• iron deficiency;
• glandular fever;
• thyroid disorders;
• other medical conditions.

Investigations are always selected according to your symptoms rather than performed routinely.

Ultrasound

If clinically appropriate, an ultrasound scan may provide additional information about the enlarged lymph node.

Ultrasound can help assess:

• size;
• structure;
• appearance;
• whether further assessment may be beneficial.

Not everyone with swollen lymph nodes requires imaging.

Is a Biopsy Always Necessary?

No.

In fact, most people with swollen lymph nodes never require a biopsy.

A biopsy is usually considered only when:

• swelling persists despite appropriate assessment;
• imaging suggests further evaluation would be helpful;
• the cause remains unclear after initial investigations.

The decision is made by the specialist team based on the overall clinical picture.

Common Mistakes People Make

Some common mistakes include:

• assuming every swollen lymph node means cancer;
• ignoring persistent swelling for several months;
• repeatedly pressing or checking the lymph node every day;
• taking antibiotics without medical advice;
• delaying assessment because the swelling is not painful.

Early medical assessment often provides reassurance and helps determine whether any further investigation is needed.

Key Takeaways

✔ Swollen lymph nodes are common and are usually related to infections.

✔ Most enlarged lymph nodes improve as the underlying illness resolves.

✔ Persistent, enlarging or unexplained swelling should be assessed by a GP.

✔ Blood tests or ultrasound are recommended only when clinically appropriate.

✔ Most swollen lymph nodes are not caused by cancer.

✔ Severe swelling affecting breathing or swallowing requires immediate emergency assessment.

Frequently Asked Questions

How long do swollen lymph nodes usually last?

Many begin to improve within a few weeks as the underlying infection settles. However, the exact duration varies depending on the cause.

Are swollen lymph nodes always painful?

No. Some enlarged lymph nodes are tender, while others are painless. Pain alone cannot determine the underlying cause.

Can stress cause swollen lymph nodes?

Stress is not considered a common direct cause of enlarged lymph nodes.

Should I massage a swollen lymph node?

No. Repeatedly pressing or massaging the area is unlikely to help and may increase tenderness.

Do I always need antibiotics?

No. Many swollen lymph nodes are caused by viral infections, for which antibiotics are not effective.

When should I worry about a swollen lymph node?

If the swelling persists, becomes larger, appears without an obvious cause or is accompanied by symptoms such as unexplained weight loss, persistent fever or night sweats, you should arrange a GP assessment.

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Concerned About Swollen Lymph Nodes? Speak to an Experienced Private GP

Finding a swollen lymph node can be worrying, particularly if it persists or you are unsure why it has appeared. Although most swollen lymph nodes are linked to common infections and settle without complications, persistent or unexplained swelling deserves a proper medical assessment.

At Evergreen Richmond Medical, our experienced Private GPs provide comprehensive, unrushed consultations to assess your symptoms, review your medical history and examine the affected area carefully. When clinically appropriate, we can arrange on-site blood tests, advise whether imaging or specialist referral may be beneficial and help you understand every step of the assessment process.

If you have noticed a swollen lymph node that is persistent, increasing in size or causing concern, book a Private GP appointment today for a personalised assessment and expert advice.