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Swollen Lymph Nodes – Causes and Treatment

Swollen lymph nodes refer to the enlargement of one or more lymph nodes, often signaling an immune response to infection, inflammation, or in rare cases a more serious condition.

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Things worth knowing about "Swollen Lymph Nodes"

Swollen lymph nodes refer to the enlargement of one or more lymph nodes, often signaling an immune response to infection, inflammation, or in rare cases a more serious condition.

What Are Swollen Lymph Nodes?

Swollen lymph nodes (medically termed lymphadenopathy) occur when one or more lymph nodes enlarge beyond their normal size. Lymph nodes are small, bean-shaped glands distributed throughout the body that form a critical part of the immune system. They filter harmful substances and help the body fight infections. Under normal circumstances, lymph nodes are barely noticeable. When they become swollen, it is typically a sign that the immune system is actively responding to a threat.

Causes

Swollen lymph nodes can result from a wide variety of causes, including:

Infections: Bacterial infections (e.g., strep throat, scarlet fever), viral infections (e.g., common cold, influenza, infectious mononucleosis, COVID-19), or parasitic diseases.
Inflammatory conditions: Autoimmune diseases such as lupus erythematosus or rheumatoid arthritis can cause lymph node enlargement.
Medication reactions: Certain drugs may trigger lymphadenopathy as a side effect.
Vaccination responses: Temporary swelling of nearby lymph nodes can occur after immunizations.
Malignant diseases: In rare cases, lymphomas, leukemias, or metastases from other cancers may be responsible for enlarged lymph nodes.

Symptoms

Swollen lymph nodes are typically characterized by the following signs:

Palpable or visible lump beneath the skin, most commonly in the neck, armpit, or groin
Tenderness or pain when touched
Redness or warmth of the overlying skin (in bacterial infections)
Accompanying systemic symptoms such as fever, fatigue, or night sweats, depending on the underlying cause

Painful lymph node swellings are usually a sign of an acute infection, while painless, firm, and immovable lymph nodes may point to a more serious underlying condition.

Diagnosis

Diagnosis begins with a thorough physical examination and a detailed medical history. The physician assesses the size, consistency, mobility, and tenderness of the affected lymph nodes. Further diagnostic steps may include:

Blood tests: Complete blood count, inflammatory markers (CRP, ESR), and specific antibody tests
Imaging: Ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI) for detailed assessment
Lymph node biopsy: Tissue sampling for histological analysis, recommended when a malignant cause cannot be excluded

Treatment

Treatment depends entirely on the underlying cause:

Infection-related swellings usually resolve on their own once the infection is treated. Bacterial infections are managed with antibiotics.
Inflammatory conditions are treated with anti-inflammatory drugs or immunosuppressants.
Malignancy-related swellings require oncological therapy tailored to the specific diagnosis, such as chemotherapy, radiation therapy, or targeted immunotherapy.

When to See a Doctor

Medical attention should be sought promptly if any of the following apply:

Swollen lymph nodes without an apparent cause that persist for more than two to four weeks
Painless, hard, and immovable lymph nodes
Accompanying symptoms such as unexplained weight loss, persistent fever, or night sweats
Multiple swollen lymph node regions appearing simultaneously

References

World Health Organization (WHO): Lymphadenopathy – Immunological Basis and Clinical Relevance. www.who.int (2023)
Kasper, D. L. et al.: Harrison's Principles of Internal Medicine, 21st Edition. McGraw-Hill Education (2022)
Ferrer, R.: Lymphadenopathy: Differential Diagnosis and Evaluation. American Family Physician, 58(6), 1313–1320 (1998). PubMed PMID: 9803196

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