Swollen Lymph Nodes: Causes, Symptoms and When to See a Specialist

Know the Signs, Understand the Causes, and Find the Right Specialist

Swollen lymph nodes are one of the most common reasons patients seek medical advice about a lump in the neck or jaw. In most cases, the swelling is a temporary response to an infection and resolves on its own. But not every neck lump is a lymph node — and not every swollen lymph node is straightforward. Knowing the difference matters.

At Faces Facial Surgery, Dr. Miguel Lopes Oliveira evaluates patients with cervical and facial masses regularly. As a maxillofacial surgeon based in Lisbon and Évora, his work includes not only treating swollen lymph nodes but also distinguishing them — clinically and surgically — from other neck lumps that can look and feel very similar: branchial cysts, thyroglossal duct cysts, lipomas, and salivary gland tumours.

This article explains what swollen lymph nodes are, what causes them, what the warning signs are, and how a specialist assessment works.

📘 View article summary ▾

• Lymph nodes swell when the immune system reacts to infection, inflammation, or — less commonly — a tumour.
• The most common causes in the neck and jaw region are dental infections, tonsillitis, and viral upper respiratory infections.
• Several other cervical masses — including branchial cysts and thyroglossal duct cysts — can closely mimic swollen lymph nodes and require specialist evaluation to distinguish.
• Certain red flags (persistence beyond 2–3 weeks, progressive growth, hard texture, painlessness) warrant prompt specialist assessment.
• A maxillofacial surgeon is specifically trained to evaluate, investigate, and surgically manage lumps in this region.

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What Are Lymph Nodes and Why Do They Swell?

Lymph nodes are small, bean-shaped glands distributed throughout the body as part of the lymphatic system. They act as biological filters, trapping bacteria, viruses, and abnormal cells before they can spread. When the lymph nodes detect a threat, immune cells multiply inside them — and this activity causes them to enlarge. This process is called lymphadenopathy.

In the context of a maxillofacial assessment, the most clinically relevant lymph nodes are those located in the neck (cervical lymph nodes), under the jaw (submandibular), under the chin (submental), and around the parotid gland (parotid lymph nodes). These are the nodes most often affected by conditions related to the teeth, mouth, salivary glands, and soft tissues of the face and neck.

Common Causes of Swollen Lymph Nodes in the Neck and Jaw

The vast majority of cases in this region are caused by infections — most of which are self-limiting. The most frequent include:

Infections

• Dental infections and abscesses — bacteria from an infected tooth, abscess, or surrounding gum tissue can cause rapid, often painful swelling of the submandibular or submental lymph nodes.
• Tonsillitis and pharyngitis — inflammation or bacterial infection of the tonsils is one of the most common triggers for bilateral cervical lymph node swelling, particularly in the upper neck.
• Ear infections (otitis) — especially in children, ear infections frequently cause swelling of nodes behind or below the ear.
• Viral upper respiratory infections — including the common cold and influenza.
• Mononucleosis (glandular fever) — caused by the Epstein-Barr virus, producing marked and often prolonged lymph node swelling throughout the neck.

Inflammatory and Autoimmune Conditions

Systemic conditions such as rheumatoid arthritis or other autoimmune disorders can cause lymph node enlargement as part of a generalised immune response. These cases typically involve multiple regions simultaneously and require specialist investigation.

Tumours

Less commonly, persistent swollen lymph nodes in the neck may reflect a malignant process — either a primary lymph node tumour (such as lymphoma) or a metastatic deposit from a tumour of the oral cavity, salivary glands, or other structures in the head and neck region. This is one of the key reasons why certain patterns of lymph node enlargement require urgent specialist evaluation.

Not Every Neck Lump Is a Lymph Node — The Differential Diagnosis

One of the most important clinical challenges in this region is distinguishing swollen lymph nodes from other cervical masses that can present in an almost identical way. In the practice of a maxillofacial surgeon, this differential diagnosis is routine — and getting it right determines the correct treatment.

The following conditions are frequently confused with lymphadenopathy:

Branchial Cyst

A branchial cyst is a congenital lesion arising from remnants of the branchial arches — structures present during embryonic development. It typically presents as a soft, non-tender lateral neck mass, most often in young adults. It can increase in size during or after an upper respiratory infection, which sometimes leads to it being misidentified as a reactive lymph node. Surgical excision is the definitive treatment, and this is one of the most common neck operations performed at Faces Facial Surgery.

→ Read more about branchial cysts

Thyroglossal Duct Cyst

A thyroglossal duct cyst develops from a remnant of the thyroglossal tract — the pathway the thyroid gland follows during its descent in the embryo. It presents as a midline neck mass, typically at or just below the hyoid bone, and characteristically moves upward when the patient swallows or protrudes the tongue. It is often painless and may be present for years before being evaluated. Like branchial cysts, it can become infected and transiently resemble an inflammatory lymph node. Treatment is surgical (Sistrunk procedure).

Lipoma

A lipoma is a benign tumour composed of fatty tissue. In the neck, lipomas can develop in the subcutaneous layer or in deeper tissue planes, and their soft, smooth consistency may initially seem consistent with a reactive lymph node. They grow very slowly, are typically painless, and do not fluctuate with infections. Ultrasound is usually sufficient to characterise them, and surgical removal is straightforward when desired.

Salivary Gland Tumours and Swelling

The parotid gland, submandibular gland, and sublingual gland all lie in close anatomical proximity to regional lymph nodes. Parotid masses in particular — whether benign (such as a pleomorphic adenoma) or malignant — can be mistaken for enlarged parotid lymph nodes. Similarly, submandibular gland pathology (obstruction by salivary stones, sialadenitis, or tumours) frequently presents as a jaw or neck mass that requires clinical and imaging differentiation from lymphadenopathy.

→ Read more about salivary gland conditions

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Recognising the Symptoms

When lymph nodes are the cause of a neck lump, the typical features include:

• A visible or palpable swelling under the skin, most often in the neck, below the jaw, or behind the ear
• Tenderness or pain when the area is pressed — particularly in acute infectious cases
• Localised warmth or redness of the overlying skin
• Fluctuation in size — the swelling may increase during an infection and partially resolve afterwards
• Bilateral presentation — reactive nodes often appear on both sides of the neck simultaneously

Importantly, the absence of pain does not rule out lymph node swelling — and painless enlargement is one of the features that most warrants further investigation.

Red Flags: When to Seek Specialist Evaluation

Most swollen lymph nodes caused by infections resolve within two to three weeks with appropriate treatment of the underlying cause. The following features, however, should prompt a prompt specialist assessment:

How Is the Diagnosis Made?

The evaluation of a neck mass begins with a careful clinical history and physical examination. The surgeon assesses the size, consistency, location, mobility, and relationship of the mass to surrounding structures, and correlates this with the patient’s symptoms and medical background.

Depending on the clinical picture, further investigations may include:

• Ultrasound — the first-line imaging tool for neck masses; it provides detailed information about the internal structure of a lymph node, distinguishes solid from cystic lesions, and can characterise vascular flow patterns
• CT or MRI scan — used when the extent of the mass requires deeper assessment, when multiple structures are involved, or when malignancy is suspected
• Blood tests — including full blood count and targeted tests for specific infections (e.g., Epstein-Barr virus, cytomegalovirus)
• Fine-needle aspiration cytology (FNAC) — a minimally invasive procedure in which a small sample of cells is taken from the mass under ultrasound guidance, allowing cytological analysis without the need for open surgery
• Excision biopsy — when FNAC is non-diagnostic or when clinical suspicion is high, surgical removal of the node provides a definitive histological diagnosis

Treatment Options

Treatment is always determined by the underlying cause, and the approach must be individualised to each patient’s clinical situation:

• Bacterial infections: antibiotics, combined with treatment of the primary focus — for example, dental extraction or drainage of an abscess
• Viral infections: supportive management; the lymph nodes typically resolve once the infection clears
• Reactive lymphadenopathy without a clear cause: a period of watchful waiting with clinical review, combined with imaging
• Lymphoma: surgical biopsy for diagnosis, followed by referral for staging and treatment
• Metastatic disease: treatment depends on the primary tumour site; surgical management in collaboration with oncology
• Cervical cysts confirmed at diagnosis (branchial, thyroglossal): surgical excision

The Role of the Maxillofacial Surgeon

A maxillofacial surgeon has specific training and surgical experience in the face, jaws, mouth, salivary glands, and neck — the precise anatomical territory where most cervical masses occur. This makes the maxillofacial surgeon well-placed not only to evaluate and investigate neck lumps, but also to manage the full spectrum of surgical outcomes: from excision biopsy to removal of branchial cysts, thyroglossal duct cysts, and salivary gland tumours.

At Faces Facial Surgery, patients presenting with a neck or jaw lump undergo a structured assessment integrating clinical examination, imaging, and — where necessary — minimally invasive or surgical tissue sampling. The goal is always to reach an accurate diagnosis efficiently, and to offer a clear treatment pathway.

If you have a neck or jaw lump that has not resolved after two to three weeks, or that presents any of the features described above, we recommend seeking an evaluation.

Swollen lymph nodes in the neck and jaw are common, and in most cases they reflect the body’s normal immune response to an infection. But the neck is also a region where several other lesions — cysts, salivary gland tumours, lipomas — can present in a strikingly similar way. An accurate diagnosis is the foundation of the right treatment, and it always requires a direct clinical assessment.

Each case is unique and should be evaluated in person by a specialist, taking into account clinical findings, imaging results, and individual history.

📚 View references ▾

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