Benign Breast Lumps: Fibroadenoma, Cysts & Other Causes

What is a benign breast lump?

A benign breast lump is a growth or swelling in the breast that is not cancer and cannot spread to other parts of the body.

Benign lumps are far more common than breast cancer, especially in women under 40. They usually develop because breast tissue responds to hormones throughout life — during puberty, the monthly cycle, pregnancy, breastfeeding and the menopause. The most common types are:

Fibroadenomas — smooth, rubbery, mobile lumps, most often in younger women.
Breast cysts — fluid-filled sacs, most often between about 35 and the menopause.
Fibrocystic changes — general lumpiness and tenderness that varies with the cycle.
Fat necrosis — firm scar-like tissue after an injury, surgery or radiotherapy.
Lipomas — soft, slow-growing lumps of fatty tissue.
Intraductal papillomas — small growths inside a milk duct, often causing nipple discharge.

You cannot reliably tell a benign lump from a cancerous one by touch, so a new lump always needs a medical check. If you want to know which changes are more worrying, see our page on breast cancer symptoms.

Most breast lumps are not cancer, but every new lump should be checked.

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What is a fibroadenoma?

A fibroadenoma is a common, non-cancerous lump made of glandular and connective tissue; it usually feels smooth, firm or rubbery and moves easily under the skin.

Fibroadenomas are most often found in women aged roughly 15 to 35, although they can occur at any age. Because they slip away under the fingers, they are sometimes called a “breast mouse”. Most are painless and between 1 and 3 cm in size.

What happens to fibroadenomas over time?

Many fibroadenomas stay the same size, and some shrink or disappear, often after the menopause. A few grow, particularly during pregnancy or in teenagers. Fibroadenomas larger than about 5 cm are called giant fibroadenomas, and fast-growing ones in adolescents are called juvenile fibroadenomas.

Do fibroadenomas need treatment?

Usually not. Once a fibroadenoma has been confirmed by imaging and, where needed, a core needle biopsy, it can often be left alone. Removal may be considered if it is large, growing, uncomfortable or causing anxiety, or if the biopsy result is not completely clear. A complex fibroadenoma (one containing other benign changes such as cysts or calcium deposits) is still benign, but is associated with a slightly higher long-term risk of breast cancer.

What are breast cysts?

Breast cysts are fluid-filled sacs within the breast tissue; they are very common, almost always benign and often feel like a smooth, firm grape or a soft balloon.

Cysts are most common between the age of about 35 and the menopause, and in women taking hormone replacement therapy (HRT). They can appear quickly, may be tender, often change with the menstrual cycle and can occur in one or both breasts. Some women develop several cysts over the years.

An ultrasound scan is usually enough to show whether a lump is a simple cyst. A simple cyst that causes no symptoms does not need treatment. If it is large or painful, the doctor can drain it with a fine needle (fine-needle aspiration), which usually makes it disappear straight away.

Further tests are usually recommended if:

The fluid drained is bloodstained.
A lump is still felt after the cyst has been drained.
The cyst keeps coming back in the same place.
The ultrasound shows a complex cyst with solid areas inside it.

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What are fibrocystic breast changes?

Fibrocystic breast changes are a normal variation in breast tissue that makes the breasts feel lumpy, rope-like or tender, usually more so in the days before a period.

The term describes a combination of fibrous (denser) tissue and small cysts. It was once called “fibrocystic breast disease”, but doctors no longer regard it as a disease: it affects a large proportion of women at some point between puberty and the menopause.

Typical features include:

General lumpiness, often in the upper outer part of both breasts.
Tenderness or aching that builds up before a period and eases afterwards.
Lumps that seem to come and go or change in size.

Fibrocystic changes do not turn into cancer. The practical challenge is that lumpy breasts make new changes harder to notice, so it helps to get to know what is normal for you. A lump that stands out from the rest, persists after your next period or is only in one breast should be checked. If tenderness is the main problem, our page on breast pain explains self-help and treatment.

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What are fat necrosis, lipoma and intraductal papilloma?

Fat necrosis, lipoma and intraductal papilloma are less common benign causes of breast lumps or symptoms; none of them is cancer.

Fat necrosis

Fat necrosis happens when fatty breast tissue is damaged and replaced by firm scar tissue. It can follow a bruise or seatbelt injury, breast surgery (including reduction, lift and reconstruction), fat grafting or radiotherapy. It may feel hard and irregular, and occasionally pulls the skin in, so it can look like cancer on examination or a mammogram. Imaging and sometimes a biopsy confirm it. Many areas soften over months; troublesome ones can be removed.

Lipoma

A lipoma is a soft, painless, slow-growing lump of fat cells under the skin. It usually feels doughy and moves easily. Treatment is only needed if it is large, uncomfortable or uncertain on imaging. A soft swelling in the armpit can also be extra breast tissue; see accessory breast tissue.

Intraductal papilloma

An intraductal papilloma is a small, wart-like growth inside a milk duct, usually close to the nipple. It most commonly causes a clear or bloodstained nipple discharge from a single duct, and sometimes a small lump behind the nipple. It is benign, but it is usually removed or sampled thoroughly, because an area of abnormal cells can occasionally be found within or next to it.

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What is a phyllodes tumour?

A phyllodes tumour is a rare breast lump that grows from the connective tissue of the breast; most are benign, some are borderline, and a small minority are malignant.

Phyllodes tumours often look like a fibroadenoma on a scan but tend to grow faster, and they most often appear in women in their 40s. A core needle biopsy may suggest the diagnosis, but the final classification — benign, borderline or malignant — is made by the pathologist after the whole lump has been removed.

Treatment is surgical removal with a margin of normal tissue around it, because phyllodes tumours can come back in the same place if removed too narrowly. Benign phyllodes tumours do not spread, and follow-up is usually with clinical examination and ultrasound. If a large lump has to be removed, the breast surgeon may plan the operation so that the breast shape is preserved; this is where oncoplastic techniques can help.

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How are breast lumps diagnosed?

Breast lumps are diagnosed with a “triple assessment”: a clinical examination, breast imaging (ultrasound and/or mammogram) and, if needed, a needle biopsy.

Clinical examination — a doctor asks about your symptoms, cycle, medication and family history, and examines both breasts and armpits.
Imaging — ultrasound is usually the first test under about 40, because young breast tissue is dense; a mammogram is usually added from around 40. MRI is used only in selected cases.
Biopsy — a core needle biopsy, taken under local anaesthetic with ultrasound guidance, removes small samples of tissue for the pathologist. Fine-needle aspiration is used to drain cysts.

Results are combined. A lump is called benign with confidence only when all three parts agree. If they do not, further sampling or removal is advised.

Where to start in Germany, Bulgaria and the UK

Germany: the usual first step is your Frauenarzt (gynaecologist), who examines you and often performs a breast ultrasound or refers you for a mammogram, and to a certified Brustzentrum (breast centre) if a biopsy is needed. Women aged 50 to 75 are invited to the national Mammographie-Screening programme every two years.
Bulgaria: you usually start with your GP (общопрактикуващ лекар), who can refer you to a mammology specialist (мамолог) for ultrasound, mammogram and biopsy.
UK: your GP can refer you to a breast clinic, where triple assessment is often done in a single visit.

More detail on each test is on our breast cancer diagnosis page. If you have implants, tell the radiographer beforehand; see mammograms with breast implants.

What usually happens after you report a lump: examination, imaging, a biopsy if needed, and a plan agreed by the breast team.

When should a benign breast lump be removed?

A benign breast lump usually only needs removal if it is large or growing, causes pain or visible change, gives an uncertain biopsy result, or if you strongly prefer to have it out.

Common reasons a breast team recommends removal include:

A fibroadenoma larger than about 3 cm, or one that grows on follow-up scans.
A suspected phyllodes tumour.
An intraductal papilloma or an area of atypical cells on biopsy.
A lump that is painful or changes the shape of the breast.
Persistent worry, after the benign result has been explained.

Option	How it works	Best suited to
Monitoring	Repeat examination and ultrasound after a few months	Small, confirmed fibroadenomas and simple cysts
Fine-needle aspiration	Fluid drained through a thin needle	Painful or large simple cysts
Vacuum-assisted excision	A probe removes the lump in small pieces through a cut of a few millimetres, under local anaesthetic and ultrasound guidance	Many fibroadenomas up to about 3 cm, papillomas
Surgical excision	The lump is removed through a small incision, usually under general anaesthetic	Larger lumps, phyllodes tumours, uncertain results

Surgeons try to place incisions where they heal discreetly, for example at the edge of the areola or in the breast fold. Most scars fade well over a year; our page on breast surgery scars explains scar care.

Breast fold (inframammary)
Edge of the areola (periareolar)
Armpit (axillary)

Where incisions are usually placed when a lump is removed surgically: the edge of the areola, the breast fold or the armpit.

Do benign breast lumps increase the risk of breast cancer?

Most benign breast lumps — simple cysts, simple fibroadenomas, fibrocystic changes, lipomas and fat necrosis — do not increase your risk of breast cancer, or increase it only very slightly.

Doctors divide benign breast conditions into three broad groups based on what the pathologist sees under the microscope:

Non-proliferative changes (such as simple cysts): no meaningful increase in risk.
Proliferative changes without atypia (such as complex fibroadenoma, papilloma, usual ductal hyperplasia): a small increase in risk.
Atypical hyperplasia (atypical ductal or lobular hyperplasia): a more noticeable increase, so closer monitoring and sometimes earlier or more frequent screening are offered.

A benign lump does not turn into cancer. The risk figures describe the breast tissue as a whole over many years. If you also have a strong family history, ask about a referral to a family history or genetics service; our page on hereditary breast cancer and BRCA explains when this is advised.

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When should I see a doctor urgently about a breast lump?

See a doctor within a few days about any new breast lump, and urgently if the lump is hard and fixed, growing quickly, or comes with skin, nipple or armpit changes.

Ask for an urgent appointment if you notice:

A new lump that is hard, irregular or does not move.
Dimpling, puckering, thickening or orange-peel skin.
A nipple that has recently turned inwards, or a nipple rash.
Bloodstained or clear discharge from one nipple without squeezing.
A lump or swelling in the armpit or above the collarbone.
A lump that keeps growing, including one previously called benign.
Redness, heat and swelling with fever, which may be infection — see mastitis and breast abscess.

The right first step for any breast lump is your GP, family doctor, gynaecologist or a breast clinic — not a plastic surgeon. Dr. Fatih Kılıç is a plastic and reconstructive surgeon; his role begins later, if surgery has changed the shape of your breast or you are considering reconstruction or corrective breast surgery.

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Seeing a doctor at home first, and when an opinion from Istanbul helps

If you live in Germany, Bulgaria or the UK and find a breast lump, the first step is always a local assessment by your own Frauenarzt, GP or breast clinic, where examination, imaging and biopsy can be done promptly. An opinion from Istanbul becomes relevant only later, for example if a lump removal or other breast surgery has left a dent, scar or asymmetry you would like corrected. Istanbul is about 1 hour 15 minutes by air from Sofia and about 3 hours from major German airports. You can share your reports and photographs online for an initial view from Dr. Fatih Kılıç, and after any treatment you receive a written summary for your doctor at home. See international patients or contact us.

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Frequently asked questions

How can I tell if a breast lump is benign?

You cannot tell reliably by touch. Benign lumps are often smooth, rubbery and mobile, but some cancers feel the same. A doctor confirms a benign lump with examination, imaging and, if needed, a needle biopsy.

Are most breast lumps cancer?

No. Most breast lumps are benign, particularly in women under 40, with fibroadenomas, cysts and fibrocystic changes being the most common causes. Every new lump should still be checked by a doctor.

Can a fibroadenoma turn into cancer?

A simple fibroadenoma does not turn into cancer. A complex fibroadenoma is linked to a slightly higher long-term risk of breast cancer in the breast tissue generally, which is why the biopsy report matters.

Do breast cysts go away on their own?

Many cysts shrink or disappear on their own, often after a period or the menopause. A large or painful cyst can be drained with a fine needle in clinic, which usually makes it vanish immediately.

Does a fibroadenoma have to be removed?

Usually not. Small fibroadenomas confirmed by imaging and biopsy can be monitored. Removal is considered if they are larger than about 3 cm, growing, painful or uncertain on biopsy.

What is vacuum-assisted excision?

It is a minimally invasive way of removing some benign breast lumps through a tiny cut using a needle-like probe and suction, usually under local anaesthetic and ultrasound guidance. Most people go home the same day with a small scar.

Is a painful breast lump less likely to be cancer?

Painful lumps are more often cysts or hormonal changes, but pain does not rule out cancer. Any new lump, painful or not, should be examined.

What is the triple assessment for a breast lump?

Triple assessment combines a clinical examination, imaging with ultrasound and/or mammogram, and a needle biopsy if needed. A lump is considered benign when all three results agree.

Can a benign breast lump come back after removal?

Most do not, but new fibroadenomas or cysts can develop elsewhere in the breast. Phyllodes tumours are more likely to recur in the same place if not removed with a margin of normal tissue.

Do benign breast lumps affect breastfeeding?

Most benign lumps do not affect breastfeeding. Fibroadenomas may grow a little during pregnancy, and any lump that changes should be shown to your doctor.

Can men get benign breast lumps?

Yes. The most common cause in men is gynaecomastia, an enlargement of breast gland tissue. Men should also have any new breast lump checked, because male breast cancer, while rare, does occur.

Medically reviewed by Dr. Fatih Kılıç, Plastic, Reconstructive and Aesthetic Surgeon. This page is for general information and does not replace an individual consultation.

Benign Breast Lumps: Fibroadenoma, Cysts & Other Non-Cancerous Causes