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Breast Lumps: Causes, Warning Signs, Tests & Treatment

  • Prof. Dr. Zahid Mahmood
  • August 10, 2026

Breast Lumps: Causes, Warning Signs, Tests & Treatment

Medically reviewed by Prof. Dr. Zahid Mahmood, MBBS, FCPS — General, Laparoscopic & Laser Surgeon, Lahore.

Finding a breast lump is understandably worrying, but most breast lumps are not cancer. Common causes include fibroadenomas, cysts, hormonal nodularity, infection and changes related to breastfeeding. However, it is not possible to identify every lump safely by touch alone, so a new or persistent lump should be medically assessed.

The standard approach is triple assessment: clinical examination, appropriate breast imaging and, when necessary, a needle biopsy. When all three findings agree, diagnosis is highly reliable.

What can cause a breast lump?

Fibroadenoma

A fibroadenoma is a common benign solid lump, especially in women aged 15 to 25. It is often smooth, firm, well-defined and mobile. A typical fibroadenoma confirmed on ultrasound may only need observation, while an enlarging, atypical or uncertain lesion may need core biopsy or removal.

Breast cyst

A cyst is a fluid-filled sac, common between approximately 35 and 55 years of age. It may appear suddenly, feel smooth or tense, and sometimes be tender. Ultrasound distinguishes a simple fluid-filled cyst from a solid or complex lesion. A painful simple cyst can be drained with a needle; a residual lump, bloody fluid or solid component requires further evaluation.

Hormonal or fibrocystic change

Breasts can feel generally nodular or tender, particularly before menstruation. Cyclical changes often affect both breasts and vary during the month. A new discrete lump within otherwise lumpy tissue still requires assessment.

Breast infection or abscess

Mastitis and an abscess can cause a painful lump with redness, warmth and fever. They are common during breastfeeding but can also occur outside lactation. An abscess may require ultrasound, antibiotics and drainage. Persistent inflammation, particularly outside breastfeeding, must be reassessed because inflammatory breast cancer can sometimes mimic infection.

Galactocele

A galactocele is a benign milk-filled cyst during or after breastfeeding. Ultrasound and aspiration can confirm the diagnosis. Breastfeeding can usually continue unless the treating clinician advises otherwise.

Fat necrosis or haematoma

Injury, surgery or pressure from a seatbelt can cause bleeding or damaged fatty tissue that forms a lump. Because fat necrosis can resemble cancer clinically or on imaging, biopsy is sometimes needed.

Phyllodes tumour

A phyllodes tumour is an uncommon fibroepithelial lump that can grow rapidly and resemble a fibroadenoma. Most are benign, but some are borderline or malignant. Rapid growth or a large mass needs prompt imaging and tissue diagnosis; treatment is usually surgical excision with an appropriate margin.

Breast cancer

Breast cancer can present as a painless lump, but pain does not exclude cancer. Early diagnosis improves treatment options and outcomes. Do not wait for a lump to become painful or large before arranging assessment.

Warning signs requiring prompt assessment

Arrange medical assessment for any new breast lump or unexplained thickening. Seek prompt review if there is:

  • A hard, irregular or fixed lump
  • A lump that persists or increases in size
  • Skin dimpling, puckering or an orange-peel appearance
  • A newly inverted or pulled-in nipple
  • Spontaneous bloody or clear discharge from one nipple
  • A persistent scaly, crusted or ulcerated nipple
  • Change in breast shape or unexplained one-sided swelling
  • A lump in the armpit or above the collarbone
  • Redness and swelling that do not improve as expected with infection treatment

Young age and the presence of pain reduce neither the need for assessment nor the importance of a persistent lump.

What is triple assessment?

1. Clinical assessment

The clinician asks when the lump was noticed, whether it changes with menstruation, and about pain, nipple discharge, pregnancy, breastfeeding, medication, previous breast problems and family history. Both breasts and the lymph-node areas are examined.

2. Breast imaging

Ultrasound is commonly the first test in younger women, during pregnancy or breastfeeding, and helps distinguish a cyst from a solid mass. It also guides needle aspiration or biopsy.

Diagnostic mammography is usually important in women aged 40 and over and may also be used at younger ages according to findings and local practice. Mammography and ultrasound often provide complementary information.

Breast MRI is not the routine first test for every lump. It is reserved for selected situations, such as discordant findings, particular cancer staging questions or high-risk assessment.

3. Needle sampling

A core needle biopsy removes small tissue samples under local anaesthetic, often with ultrasound guidance. It gives more information than examination or imaging alone and is the usual way to confirm the nature of a suspicious solid lump.

Fine-needle aspiration may drain a cyst or collect cells in selected cases. Surgical removal is generally not the first diagnostic step unless needle tests are unsuitable or inconclusive.

Understanding BI-RADS

Radiologists often use the Breast Imaging Reporting and Data System (BI-RADS):

  • BI-RADS 0: more imaging or previous films are needed
  • BI-RADS 1: negative
  • BI-RADS 2: benign finding
  • BI-RADS 3: probably benign; short-interval imaging follow-up may be advised
  • BI-RADS 4: suspicious; biopsy is usually recommended
  • BI-RADS 5: highly suggestive of malignancy; biopsy and specialist management are required
  • BI-RADS 6: cancer already confirmed by biopsy

A BI-RADS category guides the next step but is not, by itself, a final tissue diagnosis.

What if the scan looks normal but I can still feel a lump?

Return to the breast clinician if a definite lump persists, grows or feels clinically concerning. Imaging must be matched to the exact palpable area. A normal mammogram does not automatically end the assessment, particularly in dense breast tissue; targeted ultrasound, follow-up or biopsy may still be appropriate.

Treatment of benign breast lumps

Treatment depends on the confirmed diagnosis:

  • Simple cyst: reassurance; aspiration if painful
  • Typical fibroadenoma: observation and imaging follow-up in selected patients
  • Growing or large fibroadenoma: biopsy and possible removal
  • Abscess: antibiotics when appropriate and drainage
  • Galactocele: observation or aspiration
  • Phyllodes tumour: surgical excision
  • Suspicious or discordant lump: repeat or surgical biopsy as advised

Do not repeatedly massage, squeeze or puncture a lump yourself. Herbal products and unprescribed hormone medicines can delay diagnosis and may cause side effects.

Breast lumps during pregnancy or breastfeeding

Most lumps during pregnancy and lactation are benign, but every persistent new lump should be assessed. Ultrasound is safe and usually the first imaging test. Mammography and core biopsy can also be performed when clinically necessary using appropriate precautions. Do not postpone evaluation until after delivery or weaning if a lump persists or has concerning features.

Breast lumps in men

Men can develop breast lumps. Gynaecomastia typically causes a rubbery disc beneath the nipple, often tender and sometimes on both sides. A hard one-sided mass, skin or nipple change, discharge or an armpit lump needs prompt assessment because male breast cancer, although uncommon, does occur.

Does family history matter?

Tell the clinician about breast or ovarian cancer in close relatives, their ages at diagnosis, male breast cancer and any known BRCA or other inherited mutation. Family history can influence risk assessment and future screening, but most people diagnosed with breast cancer do not have a strong family history. A lump must therefore be evaluated regardless of family history.

Can self-examination diagnose a lump?

Regular awareness of how your breasts normally look and feel helps you notice change, but self-examination cannot distinguish a benign lump from cancer. Check the whole breast, nipple and armpit, and report a new change rather than repeatedly checking it for months.

Common questions

Are painful lumps usually harmless?

Pain commonly accompanies benign hormonal change, a cyst or infection, but pain does not rule out cancer. A new painful lump still requires assessment.

Can a fibroadenoma turn into cancer?

A typical simple fibroadenoma is benign and usually remains so. Complex, atypical or enlarging lesions may require biopsy and closer management because imaging appearances can overlap with other conditions.

Should every lump be removed?

No. Many simple cysts and biopsy-confirmed fibroadenomas can be observed. Removal is considered for uncertainty, suspicious findings, rapid growth, large size, symptoms or patient preference.

Can a mammogram spread cancer?

No. Mammographic compression does not spread breast cancer. It is brief and helps obtain clear images using a low radiation dose.

What if the lump disappears?

A lump that completely disappears may have been hormonal or cystic. If it returns, was associated with nipple or skin changes, or you remain uncertain, arrange assessment.

Key message

Most breast lumps are benign, but no new persistent lump should be self-diagnosed. Triple assessment—clinical examination, appropriate imaging and biopsy when indicated—provides the safest route to an accurate diagnosis. Prompt evaluation offers reassurance for benign disease and earlier treatment when cancer is present.

Breast lump assessment in Lahore

Prof. Dr. Zahid Mahmood assesses breast lumps and coordinates ultrasound, mammography and image-guided core biopsy when required, with treatment planned according to the confirmed diagnosis.

For an appointment, call 0300 413 0159 or visit professorzahid.com.

This article provides general education and does not replace personal medical assessment. A new breast lump, bloody nipple discharge, skin dimpling, nipple inversion or persistent breast inflammation requires prompt clinical review.

Medical references

  1. Williams NS, O’Connell PR, McCaskie AW, editors. Bailey & Love’s Short Practice of Surgery. 28th ed. CRC Press; 2023. Chapter 58, “The breast,” pp. 915–923.
  2. NHS. Breast lumps: assessment and tests.
  3. NICE. Suspected cancer: recognition and referral (NG12), breast cancer recommendations.
  4. American College of Radiology. ACR Appropriateness Criteria: Palpable Breast Masses, 2022 update.

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