Swollen Lymph Nodes in the Neck 

Discovering a lump in your neck can be worrying. Many people notice it unexpectedly while touching their neck, shaving or applying skincare, and it can immediately raise questions about what might be causing it. One of the most common reasons for these lumps is swollen lymph nodes. These small glands are part of the body’s immune system and often enlarge when the body is fighting an infection.

Swollen lymph nodes in the neck are quite common and are usually linked to everyday illnesses such as colds, throat infections or dental problems. In many cases, the swelling appears suddenly and gradually settles as the infection improves. Because lymph nodes play an important role in filtering harmful substances and supporting immune defence, they often react quickly when the body detects infection or inflammation.

Although most swollen lymph nodes are harmless and temporary, there are situations where they may persist, grow larger or occur without an obvious cause. When this happens, it is important to understand what might be responsible and when medical evaluation may be necessary.

What Are Lymph Nodes and Why Do They Swell?

Lymph nodes are small, bean-shaped glands that form an important part of the body’s immune system. They are distributed throughout the body and are connected by a network of lymphatic vessels that carry lymph fluid [1]. These nodes act as filters, trapping bacteria, viruses and other harmful substances so that immune cells can identify and destroy them.

When the body detects infection or inflammation, lymph nodes often become more active as they produce additional immune cells to fight the problem [2]. This increased activity can cause the nodes to enlarge, leading to swelling that may be felt as a lump. Infections such as colds, throat infections, dental problems and skin infections commonly trigger this response, which is why swollen lymph nodes are often associated with illness [3].

The neck is one of the most common areas where lymph nodes become swollen because it drains lymph fluid from the face, scalp, mouth, throat and nearby structures [4]. As a result, infections or inflammation in these areas frequently lead to enlargement of the lymph nodes in the neck.

Where Are the Lymph Nodes Located in the Neck?

Several groups of lymph nodes are located throughout the neck. Each group drains lymph fluid from specific areas of the head and neck, which means the location of swelling can provide useful clues about the possible underlying cause.

• Cervical lymph nodes — These nodes run along the sides of the neck and are among the most commonly affected during infections of the throat, tonsils or upper respiratory tract [5].

• Submandibular lymph nodes — Located beneath the jaw, these nodes often enlarge in response to infections of the mouth, teeth or gums [6].

• Submental lymph nodes — Found under the chin, these nodes may swell due to infections affecting the lower lip, floor of the mouth or nearby structures [7].

• Posterior cervical nodes — These nodes lie along the back of the neck and may enlarge with scalp infections or certain viral illnesses [8].

• Supraclavicular nodes — Situated just above the collarbone, swelling in these nodes is less common and may require closer medical evaluation [9].

Because each group of lymph nodes drains a particular region, doctors often use the location of swollen nodes to help narrow down the possible source of infection or disease.

What Causes Swollen Lymph Nodes in the Neck?

Swollen lymph nodes in the neck can occur for a variety of reasons. In most cases, they develop as part of the body’s normal immune response to infection. However, persistent or unexplained swelling may sometimes be linked to other medical conditions that require further evaluation.

Viral Infections

Viral infections are one of the most common causes of swollen lymph nodes in the neck [10]. As the immune system works to fight the virus, nearby lymph nodes may enlarge and become tender.

Common viral causes include:

• The common cold
• Influenza
• Infectious mononucleosis
• COVID-19

Bacterial Infections

Certain bacterial infections affecting the throat, mouth or skin can also cause lymph nodes in the neck to swell [11]. These nodes may become painful and enlarged as the body responds to the infection.

Examples include:

• Tonsillitis
• Strep throat
• Dental infections
• Skin infections

Inflammatory and Autoimmune Conditions

In some cases, swollen lymph nodes may be associated with inflammatory or autoimmune diseases, where the immune system mistakenly attacks the body’s own tissues [12].

Examples include:

• Rheumatoid arthritis
• Lupus

Cancer-Related Causes

Although less common, swollen lymph nodes in the neck may sometimes be related to cancer [13]. This can occur when cancer originates in the lymphatic system or spreads from other areas of the body.

Possible causes include:

• Lymphoma
• Leukaemia
• Head and neck cancers

Other Less Common Causes

Certain infections and medical conditions can also lead to swollen lymph nodes in the neck, although they occur less frequently.

Examples include:

• Tuberculosis
• HIV infection
• Certain medications

What Do Swollen Lymph Nodes in the Neck Feel Like?

Swollen lymph nodes in the neck can feel different depending on the underlying cause. Noticing certain characteristics can sometimes help identify whether the swelling is related to infection, inflammation or another condition.

• Tender or painless nodes — Lymph nodes that enlarge due to infection are often tender or painful when touched, while painless swelling may occur in other conditions.

• Soft or firm nodes — Some swollen lymph nodes feel soft or rubbery, whereas others may feel firm to the touch.

• Movable or fixed nodes — Lymph nodes affected by infection are often movable under the skin, while nodes that feel fixed in place may require closer medical evaluation.

• Single or multiple enlarged nodes — In some cases, only one lymph node becomes enlarged, while infections may cause several lymph nodes in the neck to swell at the same time.

What Symptoms May Occur with Swollen Neck Lymph Nodes?

Swollen lymph nodes in the neck often appear together with other symptoms, especially when caused by infection. These symptoms can help indicate the underlying problem.

• Sore throat
• Fever
• Fatigue or general tiredness
• Runny nose or other respiratory symptoms
• Night sweats
• Unexplained weight loss

How Long Do Swollen Lymph Nodes Usually Last?

The duration of swollen lymph nodes in the neck often depends on the underlying cause. When swelling occurs as part of the body’s response to infection, it usually improves as the infection resolves.

• Typical duration with infection — Lymph nodes commonly become enlarged during illnesses such as colds, throat infections or dental infections and may remain swollen for several days to a couple of weeks.

• When swelling should start to improve — As the infection clears, the lymph nodes typically begin to reduce in size and tenderness, although they may take some time to return completely to normal.

• When persistence becomes concerning — If swollen lymph nodes remain enlarged for more than two to four weeks, continue to grow or appear without signs of infection, medical evaluation is recommended to determine the underlying cause.

When Should You See a Doctor for Swollen Lymph Nodes in the Neck?

Swollen lymph nodes in the neck are often linked to infections and may improve as the illness resolves. However, certain features may indicate the need for medical evaluation to rule out more serious underlying conditions.

• Persistent swelling — Lymph nodes that remain enlarged for more than two to four weeks should be assessed, particularly if they do not gradually reduce in size.

• Large lymph nodes — Nodes that grow larger than 1–2 cm may require further investigation.

• Hard, fixed or rapidly enlarging nodes — Lymph nodes that feel firm, do not move easily under the skin or increase in size quickly should be examined by a doctor.

• Severe pain or rapid enlargement — Significant tenderness or sudden swelling may indicate infection or other conditions that require treatment.

• Associated red flag symptoms — Symptoms such as unexplained weight loss, persistent fever, night sweats, difficulty swallowing or hoarseness alongside swollen lymph nodes should prompt medical evaluation.

• Lymph nodes without obvious infection — Swelling that occurs without symptoms of infection, particularly in adults, should be medically assessed.

• Supraclavicular lymph node enlargement — Lymph nodes located above the collarbone are less commonly affected by infection and should always be evaluated by a healthcare professional [14].

How Are Swollen Lymph Nodes in the Neck Diagnosed?

If swollen lymph nodes persist, grow larger or occur without a clear infection, doctors may perform further evaluation to determine the underlying cause. Diagnosis typically involves a combination of clinical assessment and medical tests.

Medical History and Physical Examination

The doctor will first ask about symptoms, recent infections, medical history and how long the lymph nodes have been swollen. A physical examination of the neck helps assess the size, location, tenderness and mobility of the lymph nodes.

Imaging Tests

Imaging studies may be used to examine the lymph nodes in more detail and identify the underlying structure involved.

• Ultrasound is often the first imaging test used to evaluate lymph nodes in the neck.

• CT scan provides detailed cross-sectional images and can help assess deeper structures.

• MRI may be recommended in certain cases to obtain more detailed images of soft tissues.

Blood Tests

Blood tests can help identify infections or other medical conditions that may be causing lymph node swelling.

• Infection markers may indicate inflammation or bacterial infection.

• Viral testing may be performed to detect specific viral illnesses.

Biopsy or Fine Needle Aspiration

If the cause of the swelling remains unclear, a small sample of cells may be taken from the lymph node. Fine needle aspiration or biopsy allows the tissue to be examined under a microscope to determine whether the swelling is related to infection, inflammation or cancer.

What Treatments Are Available for Swollen Lymph Nodes in the Neck?

Treatment depends on the underlying cause of the swollen lymph nodes. In many cases, the swelling improves once the primary condition is treated.

• Treating the Underlying Infection — If the swelling is caused by bacterial infection, antibiotics may be prescribed. Viral infections usually improve with supportive care as the body clears the infection.

• Medications for Inflammation — In some cases, medications may be used to reduce inflammation and relieve symptoms associated with swollen lymph nodes.

• Monitoring and Observation — When swollen lymph nodes are related to minor infections, doctors may recommend monitoring the swelling over time. The nodes often return to normal size once the infection resolves.

• Surgical Evaluation (If Needed) — If swollen lymph nodes persist, continue to enlarge or raise concern for more serious conditions, surgical evaluation may be recommended to obtain a tissue sample or remove the affected node for further examination.

How Can You Tell If a Swollen Lymph Node Might Be Cancerous?

Most swollen lymph nodes in the neck are caused by infections and resolve as the underlying illness improves. However, in some cases, certain features may raise concern that the swelling could be related to cancer. While these signs do not confirm a cancer diagnosis, they may indicate the need for further medical evaluation.

Lymph nodes that are cancerous are often firm or hard to the touch and may feel fixed in place rather than movable under the skin. Unlike nodes swollen from infection, they are usually painless and may continue to enlarge over time instead of gradually reducing in size. A lymph node that remains swollen for several weeks, especially without any symptoms of infection, should be assessed by a doctor.

The location of the lymph node can also provide important clues. For example, swollen nodes above the collarbone (supraclavicular nodes) are less commonly linked to infection and may require closer investigation. In addition, lymph node enlargement accompanied by symptoms such as unexplained weight loss, night sweats, persistent fever or fatigue may raise suspicion of an underlying systemic condition.

Because these features can overlap with other medical conditions, a proper diagnosis cannot be made based on physical examination alone. Doctors may recommend imaging tests, blood tests or procedures such as fine needle aspiration or biopsy to determine the exact cause of the swollen lymph node.

Summary 

Swollen lymph nodes in the neck are a common finding and are often the body’s natural response to infection or inflammation. Because lymph nodes play an important role in the immune system, they can enlarge when the body is fighting illnesses such as colds, throat infections, dental problems or other infections affecting the head and neck. In many cases, the swelling is temporary and gradually improves as the underlying condition resolves.

However, lymph node swelling may sometimes persist or occur without an obvious cause. Factors such as the size, firmness, location and duration of the swelling can provide important clues about whether further medical assessment is needed. Lymph nodes that remain enlarged for several weeks, grow larger over time, feel hard or fixed or are associated with symptoms such as fever, night sweats, unexplained weight loss or difficulty swallowing should be evaluated by a doctor. Diagnosis may involve clinical examination, imaging tests, blood tests or biopsy to identify the underlying cause and determine the most appropriate treatment.

If you are experiencing persistent or concerning swelling of lymph nodes in the neck, schedule a consultation with NC Tan Surgery for a thorough evaluation and appropriate management.

References 

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6. Raffoul, D. F. (2024, October 23). What you need to know: Swollen lymph nodes under the jaw? Family, Implant & Cosmetic Dentistry. https://implantandcosmeticdentistry.com/swollen-lymph-nodes-under-jaw/ 

7. Tzou, C. H., Meng, S., Ines, T., Reissig, L., Pichler, U., Steinbacher, J., Pona, I., Roka‐Palkovits, J., Rath, T., Weninger, W. J., & Cheng, M. (2017). Surgical anatomy of the vascularized submental lymph node flap: Anatomic study of correlation of submental artery perforators and quantity of submental lymph node. Journal of Surgical Oncology, 115(1), 54–59. https://doi.org/10.1002/jso.24336 

8. Stathakios, J., & Carron, M. A. (2026). Anatomy, head and neck, posterior cervical region. In StatPearls. StatPearls Publishing. http://www.ncbi.nlm.nih.gov/books/NBK551521/ 

9. Swollen supraclavicular lymph nodes: What does it mean? (2023, March 16). https://www.medicalnewstoday.com/articles/supraclavicular-lymph-nodes-swollen 

10. Australia, H. (2024, December 11). Swollen lymph nodes (Swollen glands) [Text/html]. https://www.healthdirect.gov.au/swollen-lymph-nodes 

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12. O’Byrne, A. M., & van Baarsen, L. G. M. (2024). Lymph nodes as gatekeepers of autoimmune diseases. RMD Open, 10(4), e004097. https://doi.org/10.1136/rmdopen-2024-004097 

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