Swollen Lymph Nodes Neck One Side: Causes
Swollen lymph nodes on one side of the neck are often a sign of a local infection but can also indicate other conditions. Medical evaluation is recommended.
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Swollen lymph nodes on one side of the neck are often a sign of a local infection but can also indicate other conditions. Medical evaluation is recommended.
What Are Unilateral Swollen Lymph Nodes in the Neck?
Lymph nodes are small, bean-shaped organs of the immune system distributed throughout the body. The neck contains a particularly high concentration of lymph nodes. They filter lymph fluid and help the body fight pathogens such as bacteria and viruses. When one or more lymph nodes swell on only one side of the neck, this is referred to as unilateral cervical lymphadenopathy.
Causes
There are many possible reasons why lymph nodes on one side of the neck may become enlarged. The most common causes include:
Infectious Causes (Most Common)
- Bacterial infections: e.g., tonsillitis, dental abscess, ear infection, or scarlet fever
- Viral infections: e.g., the common cold, influenza, infectious mononucleosis (glandular fever), or COVID-19
- Local skin infections: Wounds or inflammations in the head and neck region can activate nearby lymph nodes
Non-Infectious Causes
- Reactive lymphadenopathy: An immune system overreaction, e.g., in autoimmune diseases
- Malignant conditions: In rarer cases, lymphomas (e.g., Hodgkin lymphoma) or metastases from other cancers (e.g., oral, throat, or thyroid cancer) can cause one-sided lymph node swelling
- Sarcoidosis: A chronic inflammatory disease that can affect lymph nodes
Symptoms
In addition to visible or palpable swelling in the neck, the following accompanying symptoms may occur:
- Pain or tenderness in the affected area
- Redness or warmth over the swollen lymph node
- Fever, chills, or a general feeling of illness
- Difficulty swallowing or hoarseness
- Unintentional weight loss (in rarer, more serious cases)
- Night sweats (in rarer, more serious cases)
Diagnosis
A doctor will first perform a physical examination and take a medical history. Depending on the suspected cause, the following diagnostic steps may be initiated:
- Blood tests: Inflammatory markers (e.g., CRP, leukocytes), differential blood count, antibody tests
- Neck ultrasound: To assess the size, shape, and structure of the lymph nodes
- Swab tests: e.g., throat swab if a bacterial infection is suspected
- Imaging: CT or MRI scan if deeper causes are suspected
- Lymph node biopsy: Tissue sampling if a malignant condition is suspected
Treatment
Treatment depends on the underlying cause:
- Bacterial infections: Antibiotics, e.g., amoxicillin for streptococcal tonsillitis
- Viral infections: Usually symptomatic treatment with pain relievers and rest; antiviral medications only for specific pathogens
- Malignant conditions: Depending on the diagnosis, chemotherapy, radiation therapy, or surgery
- Inflammatory conditions: Anti-inflammatory medications or corticosteroids
When to See a Doctor
Medical evaluation is strongly recommended if:
- The lymph node remains swollen for more than 2 to 3 weeks
- The lymph node is steadily growing in size
- It feels hard, firm, or immovable
- Significant general symptoms such as fever, night sweats, or weight loss are present
- There is no obvious cause such as a cold or infection
References
- Swartz MH. Textbook of Physical Diagnosis: History and Examination. 8th edition. Elsevier, 2021.
- Mohseni S, Shojaiefard A, Khorgami Z et al. Peripheral Lymphadenopathy: Approach and Diagnostic Tools. Iranian Journal of Medical Sciences. 2014;39(2 Suppl):158-170.
- Gaddey HL, Riegel AM. Unexplained Lymphadenopathy: Evaluation and Differential Diagnosis. American Family Physician. 2016;94(11):896-903.
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Related search terms: swollen lymph nodes neck one side + swollen lymph node neck one sided + unilateral swollen lymph nodes neck