A breast lump can be worrying, but it is important to know that not every lump means cancer. Many breast lumps are caused by harmless changes such as cysts, fibrocystic changes, or fatty tissue growths. Still, any new breast lump should be taken seriously and evaluated by a healthcare professional.
This article explains the common causes of a breast lump, the symptoms to watch for, and when to see a doctor.
Table of Contents
What Is a Breast Lump?
A breast lump is any area in the breast that feels different from the surrounding tissue. It may feel:
- hard or soft
- smooth or irregular
- movable or fixed
- painful or painless
Breast lumps can develop in one breast or both breasts. They may also change in size during the menstrual cycle, especially in people who menstruate.
Common Causes of a Breast Lump
Breast lumps can happen for many reasons. Some are normal body changes, while others may need medical treatment.
1. Breast cysts
Breast cysts are fluid-filled sacs inside the breast. They are very common, especially in women before menopause.
Typical signs:
- round or oval lump
- smooth and movable
- may feel tender, especially before a period
Cysts are usually benign, but a doctor may recommend imaging or draining if the lump is painful or unclear.
2. Fibrocystic breast changes
Fibrocystic breast changes are noncancerous changes in breast tissue that can make the breasts feel lumpy, swollen, or tender.
Common features:
- lumpiness in both breasts
- breast tenderness or pain
- symptoms that may worsen before menstruation
This is a common and usually harmless condition.
3. Fibroadenoma
A fibroadenoma is a benign solid lump made of glandular and fibrous breast tissue. It is more common in younger women.
Typical features:
- smooth, firm lump
- easy to move under the skin
- usually painless
Fibroadenomas may grow slowly or stay the same size for years.
4. Fat necrosis
Fat necrosis happens when fatty breast tissue is damaged, often after an injury, surgery, or radiation treatment.
Possible signs:
- firm lump
- tenderness
- skin changes such as bruising or thickening
Fat necrosis can sometimes feel similar to a cancerous lump, so evaluation is important.
5. Breast infection or abscess
Breast infections are more common in people who are breastfeeding, but they can happen in others too. For more detail on related symptoms and treatment, see our guide to breast infection symptoms, causes, and treatment.
Symptoms may include:
- painful lump
- redness and warmth
- swelling
- fever or feeling unwell
An abscess is a pocket of pus and may need antibiotics or drainage.
6. Enlarged lymph nodes
Lymph nodes in or near the breast can become enlarged due to infection or inflammation.
These lumps may feel:
- small and firm
- movable
- tender
Sometimes enlarged lymph nodes require further testing.
7. Breast cancer
A breast lump can be a sign of breast cancer, although many breast lumps are not cancerous. Cancerous lumps are often painless, but not always.
Possible warning signs include:
- hard lump
- irregular shape
- fixed in place
- changes in breast skin or nipple
- growing over time
Because breast cancer can sometimes start as a small, painless lump, any new or unusual lump should be checked.
Symptoms That May Come With a Breast Lump
A breast lump may appear alone or with other symptoms. These can help a doctor understand the cause.
Common symptoms include:
- breast pain or tenderness
- swelling
- redness or warmth
- nipple discharge
- changes in breast shape
- skin dimpling or thickening
- nipple turning inward
- a lump in the armpit
- fever if there is an infection
Some symptoms, such as cyclic tenderness before a period, often suggest a benign cause. Other symptoms, such as skin dimpling or nipple changes, need prompt evaluation.
How to Check for a Breast Lump
If you notice a lump, try not to panic. Check whether it feels different from the rest of the tissue and whether it changes over time.
You may want to note:
- where the lump is located
- whether it is painful
- whether it moves under the skin
- whether it changes with your menstrual cycle
- whether there are any skin or nipple changes
Do not squeeze, massage, or repeatedly press the lump, as this can cause irritation and make it harder to assess.
When to See a Doctor
You should see a doctor if you notice any new breast lump, even if it seems small or painless. A medical evaluation is the only way to know what is causing it.
Make an appointment soon if:
- the lump is new
- the lump lasts more than one menstrual cycle
- the lump is getting bigger
- the lump feels hard or fixed
- you have breast pain that does not go away
- you notice nipple discharge
- you see skin changes, such as dimpling or redness
- you feel a lump in the armpit
Seek urgent medical attention if:
- you have a painful lump with fever
- the breast is red, swollen, and warm
- you suspect an infection or abscess
- you notice sudden major breast changes
How Doctors Evaluate a Breast Lump
A doctor may use several steps to figure out the cause of a breast lump. For a general overview of how breast symptoms are assessed, the National Cancer Institute offers helpful screening and diagnosis information at its breast screening and diagnosis page.
1. Medical history and physical exam
The doctor will ask about:
- how long the lump has been present
- pain or tenderness
- changes with your period
- family history of breast cancer
- any injury, infection, or breastfeeding history
They will also examine the breasts and nearby lymph nodes.
2. Imaging tests
Depending on your age and the lump’s features, the doctor may order:
- Ultrasound: often used to tell if a lump is fluid-filled or solid
- Mammogram: uses X-rays to look for suspicious changes in the breast
- MRI: sometimes used in specific cases
3. Biopsy
If a lump looks suspicious or is not clearly benign, the doctor may recommend a biopsy. This involves taking a small sample of tissue for testing.
How Breast Lumps Are Treated
Treatment depends on the cause.
Possible treatments include:
- watchful waiting for harmless lumps
- draining a painful cyst
- antibiotics for infection
- surgical removal of certain lumps
- biopsy or cancer treatment if needed
Not every lump needs surgery. The right treatment depends on the diagnosis.
In some cases, treatment may overlap with other breast conditions. For example, if the lump is linked to a painful infection, you may also want to read about breast implant illness: symptoms, causes, and relief if implants are part of your medical history and your doctor thinks they could be relevant.
How to Reduce Breast Health Concerns
Not all breast lumps can be prevented, but regular awareness can help you notice changes early.
Helpful steps include:
- knowing what your breasts normally feel like
- checking for changes during routine self-awareness
- keeping up with recommended breast screening
- reporting new lumps or symptoms quickly
- following up if a doctor recommends imaging or repeat exams
Key Takeaway
A breast lump can have many causes, and most are benign. Common reasons include cysts, fibrocystic changes, fibroadenomas, infection, and fat necrosis. Still, a new or changing lump should never be ignored.
See a doctor if you notice any breast lump, especially if it is hard, fixed, growing, painful, or associated with skin or nipple changes. Early evaluation gives the clearest answers and helps ensure you get the right care as soon as possible.
