About this procedure
Lymph node ultrasound describes the size, shape, internal appearance and sometimes blood flow of nodes that are accessible to the transducer.
What the examination or consultation can show
Nodes can enlarge in response to infection, inflammation and other processes. Ultrasound gives structural information but cannot, by itself, identify the cause of every enlargement or prove whether a node is cancerous.
When an assessment may help
The scan may be requested for a palpable neck, axillary or groin lump, a change noticed on an earlier scan, or follow-up related to a known inflammatory or oncological condition.
Important limitations and differences
Node size alone does not distinguish harmless immune response from a condition requiring more testing. Clinical examination, blood tests, different imaging or a separate biopsy may be needed if features or symptoms are concerning.
Preparation and procedure
The clinician moves a high-frequency transducer over the area of concern and may use Doppler to evaluate blood flow. Usually no special preparation is needed. Mention recent infections, vaccination, known diagnoses and previous imaging.
Next steps and follow-up
Ultrasound does not treat lymph-node disease. The report is interpreted with how long the node has been present, its location and associated symptoms. Some findings warrant monitoring; others need prompt further investigation.
When to seek urgent care
Rapid neck swelling with difficulty breathing or swallowing requires emergency care: call 103. Persistent enlarged nodes with fever, night sweats or unexplained weight loss require timely, though not necessarily emergency, medical review.
Related health information
Gynaecological oncology consultation; Joint and soft tissue ultrasound.
Signs and symptoms
Diagnosis and tests
Care and treatment approaches
When to seek urgent care
Frequently asked questions
Can ultrasound tell whether a lymph node is malignant?
No. It can identify suspicious features, but further investigations, sometimes including biopsy, may be required for an answer.
Is preparation necessary for superficial lymph node ultrasound?
Usually not. Wear clothing that allows the affected area to be examined.
Are enlarged lymph nodes always dangerous?
No. Reactive enlargement is common, but persistence or concerning symptoms should be assessed by a clinician.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
