Armpit Lump (Axillary Lump)
Understanding the causes, warning signs, and how ultrasound helps provide a fast and accurate diagnosis.
What is an Armpit Lump?
An armpit lump, also known medically as an axillary lump, refers to any swelling or nodule within the armpit (axilla). It may develop suddenly or gradually and can affect people of all ages. While many armpit lumps are completely harmless, others require prompt medical assessment because they may represent infection, inflammatory disease or, less commonly, cancer. Fortunately, ultrasound is considered the first-line imaging investigation for most superficial armpit lumps.
Common Causes of Armpit Lumps
| Condition | Description |
|---|---|
| Enlarged lymph nodes | Often caused by viral or bacterial infections, vaccinations or inflammation. |
| Lipoma | A harmless fatty lump beneath the skin. |
| Epidermoid/Sebaceous cyst | Blocked skin gland filled with keratin or sebum. |
| Hidradenitis Suppurativa | Chronic inflammation affecting sweat glands. |
| Abscess | A collection of infected fluid causing pain, redness and swelling. |
| Reactive lymph nodes | Common following infection or vaccination. |
| Breast-related lymph nodes | Occasionally associated with breast disease. |
| Malignancy | Less common but important to exclude. |
Symptoms
- Lump under the arm
- Pain or tenderness
- Swelling
- Skin redness
- Warmth
- Limited arm movement
- Rapid enlargement
- Persistent lump
When should you seek medical assessment?
Seek assessment if your lump:- Persists longer than 2–4 weeks
- Continues increasing in size
- Feels hard or fixed
- Is associated with breast changes
- Occurs with unexplained weight loss
- Is accompanied by persistent fever or night sweats
- Returns repeatedly
Why Ultrasound is the First-Line Investigation
Ultrasound provides detailed, real-time imaging of superficial tissues without using radiation. It allows assessment of:
- Lymph nodes
- Skin lesions
- Lipomas
- Cysts
- Abscesses
- Blood flow using Colour Doppler
- Relationship to surrounding structures
Ultrasound can often determine whether a lump appears benign or whether further investigations, such as biopsy or specialist referral, are recommended.
Can Ultrasound Diagnose Cancer?
Ultrasound cannot confirm cancer on its own. However, it is excellent at identifying suspicious features that may require further investigation. When combined with clinical examination and, where appropriate, mammography, MRI or biopsy, ultrasound plays a vital role in the diagnostic pathway.
How UKSONO Healthcare Can Help
At UKSONO Healthcare, our specialist sonographers provide comprehensive ultrasound assessment of armpit lumps using advanced ultrasound technology. Our service includes:
- High-resolution ultrasound imaging
- Colour Doppler assessment
- Experienced specialist practitioners
- Detailed clinical report
- Same-day reports in most cases
- Recommendations for onward management where appropriate
Book Your Armpit Lump Ultrasound Today
Early assessment provides reassurance when findings are benign and enables timely referral if further investigation is required.
Book Online at www.uksono.com📍 Tunbridge Wells | 📍 Orpington | 📍 Canary Wharf
☎ 01892 251532
Frequently Asked Questions
Are most armpit lumps cancer?
No. Most armpit lumps are benign and commonly relate to enlarged lymph nodes, cysts or lipomas.
Does ultrasound use radiation?
No. Ultrasound uses sound waves and does not involve ionising radiation.
Do I need a GP referral?
No. You can self-refer for an ultrasound assessment at UKSONO Healthcare.
How quickly will I receive my results?
In most cases, your ultrasound report is available on the same day.
References
- NICE Guideline NG12 – Suspected Cancer: Recognition and Referral.
- American College of Radiology (ACR) Appropriateness Criteria® – Imaging of Palpable Soft Tissue Masses.
- BMUS Guidelines for Professional Ultrasound Practice.
- European Society of Radiology (ESR) – Ultrasound of Superficial Soft Tissue Lesions.
- NHS Breast Screening Programme Guidance.
