Disease / Condition

Breast Cancer

Also known as: Invasive lobular carcinoma · Ductal carcinoma in situ · Inflammatory breast cancer · Invasive ductal carcinoma · Carcinoma of the breast

Educational only — not medical advice. Always consult a qualified healthcare professional.

Overview

Breast cancer occurs when cells in the breast begin to grow out of control, forming a tumor that can often be detected on imaging or felt as a lump. Most breast cancers begin in the ducts that carry milk to the nipple or in the lobules that produce milk. The disease can range from early-stage cancers confined to the breast to advanced cancers that have spread to other parts of the body. While breast cancer predominantly affects women, men can also develop the disease, though this is less common. Risk increases with age, and certain genetic mutations significantly elevate risk. Symptoms may include a lump in the breast or armpit, changes in breast size or shape, skin dimpling, nipple discharge, or changes in the nipple's appearance. However, early breast cancer often produces no symptoms, making regular screening important. Treatment approaches depend on the cancer's type, stage, and characteristics, and may include surgery, radiation, chemotherapy, hormone therapy, or targeted therapies. Survival rates have improved considerably due to earlier detection through mammography and better treatments. Many people diagnosed with breast cancer, particularly at early stages, can be successfully treated and live long, healthy lives.

Symptoms

A lump or mass in the breast or underarm area
Change in the size, shape, or appearance of the breast
Dimpling, puckering, or other changes in the skin of the breast
Nipple discharge other than breast milk
Nipple turning inward or changes in nipple appearance
Redness, scaling, or thickening of the nipple or breast skin
Swelling of all or part of the breast
Pain in the breast or nipple area
Skin irritation or rash on the breast
Warmth or tenderness in the breast

Causes

DNA mutations in breast cells that cause abnormal growth
Inherited genetic mutations such as BRCA1 and BRCA2
Acquired gene changes during a person's lifetime
Hormonal factors influencing cell growth
Environmental exposures that damage DNA
Combination of genetic, hormonal, and environmental factors

Risk factors

Being female
Increasing age, particularly over 50
Family history of breast or ovarian cancer
Inherited genetic mutations, especially BRCA1, BRCA2, and others
Personal history of breast cancer or certain benign breast conditions
Dense breast tissue
Early menstruation before age 12
Late menopause after age 55
Never having been pregnant or first pregnancy after age 30
Use of hormone replacement therapy after menopause
Radiation exposure to the chest area
Obesity, particularly after menopause
Regular alcohol consumption
Physical inactivity
Ashkenazi Jewish heritage

Prevention

Regular physical activity and exercise
Maintaining a healthy body weight
Limiting alcohol consumption
Breastfeeding if possible
Limiting or avoiding hormone replacement therapy
Discussing preventive medications with a doctor for high-risk individuals
Considering preventive surgery for those with very high genetic risk
Regular screening and early detection
Eating a balanced diet rich in fruits and vegetables
Avoiding or limiting tobacco exposure

Diagnosis

Clinical breast examination by a healthcare provider
Mammography screening
Breast ultrasound
Magnetic resonance imaging of the breast
Biopsy to examine tissue samples
Core needle biopsy
Fine needle aspiration
Surgical biopsy
Imaging-guided biopsy
Genetic testing for hereditary mutations
Hormone receptor testing on tumor tissue
HER2 protein testing
Staging tests including CT scans, bone scans, or PET scans

Complications

Spread of cancer to other organs such as bones, liver, lungs, or brain
Lymphedema or swelling in the arm
Pain related to cancer or treatment
Fatigue from cancer or treatments
Side effects from chemotherapy or radiation
Menopausal symptoms from certain treatments
Emotional and psychological effects
Changes in body image and self-esteem
Sexual health concerns
Bone thinning from some hormone therapies
Heart or lung problems from certain treatments
Cognitive changes sometimes called 'chemo brain'
Risk of cancer recurrence
Development of second cancers

Recovery

Recovery timeline varies widely depending on cancer stage and treatment type
Many early-stage breast cancer patients recover fully
Post-surgical recovery typically takes several weeks
Radiation and chemotherapy side effects may persist for months
Regular follow-up appointments to monitor for recurrence
Gradual return to normal activities as strength permits
Rehabilitation including physical therapy for arm mobility
Emotional recovery and adjustment to life after cancer
Long-term survivorship care and monitoring
Support groups and counseling can aid recovery

Lifestyle

Maintain regular physical activity appropriate to ability
Eat a nutritious, balanced diet
Achieve and maintain a healthy weight
Limit alcohol intake
Avoid tobacco products
Manage stress through relaxation techniques or counseling
Get adequate sleep and rest
Stay connected with supportive family and friends
Attend all follow-up medical appointments
Participate in cancer survivorship programs if available
Consider joining support groups
Communicate openly with healthcare providers about concerns
Practice self-care and monitor for any new symptoms

When to seek care

Seek medical evaluation promptly if you notice any new lump or mass in the breast or underarm, changes in breast appearance or texture, nipple discharge or changes, persistent breast pain, or skin changes on the breast. Do not wait for pain to develop, as many breast cancers are painless in early stages. If you have been diagnosed with breast cancer, seek immediate care for severe pain, difficulty breathing, severe headaches, bone pain, abdominal swelling, persistent nausea or vomiting, signs of infection such as fever, or any symptoms that concern you during treatment. Regular screening mammograms as recommended by your healthcare provider are essential for early detection.

Related specialists

Oncologist
Surgical oncologist
Radiation oncologist
Breast surgeon
Medical oncologist
Radiologist
Pathologist
Plastic surgeon for reconstruction
Genetic counselor
Oncology nurse specialist
Palliative care specialist
Psychologist or psychiatrist
Physical therapist
Social worker

FAQs

Can men get breast cancer?

Yes, men can develop breast cancer, though it is much less common than in women. Men have a small amount of breast tissue where cancer can develop. Male breast cancer often presents as a lump beneath the nipple and requires the same serious medical attention as breast cancer in women.

Does finding a lump mean I have cancer?

Not necessarily. Most breast lumps are not cancerous. Many are caused by benign conditions such as cysts or fibroadenomas. However, any new lump should be evaluated by a healthcare provider to determine its nature through examination and possibly imaging or biopsy.

At what age should I start getting mammograms?

Screening recommendations vary by organization and individual risk factors. Many guidelines suggest starting regular mammograms at age 40 or 50 for average-risk individuals. Those with higher risk due to family history or genetic factors may need to start earlier. Discuss your personal risk and appropriate screening schedule with your healthcare provider.

Is breast cancer hereditary?

Some breast cancers have a hereditary component. About 5 to 10 percent of breast cancers are thought to be linked to inherited gene mutations, most commonly BRCA1 and BRCA2. However, most breast cancers occur in people with no family history. Having a family history increases risk but does not guarantee cancer will develop.

What is the survival rate for breast cancer?

Survival rates vary greatly depending on the stage at diagnosis and cancer characteristics. When detected early and confined to the breast, five-year relative survival rates are very high. Even for cancers that have spread regionally, many people live for years with treatment. Advanced stage cancers have lower survival rates, but treatments continue to improve outcomes.

Will I lose my breast if I have breast cancer?

Not always. Many people with early-stage breast cancer can have a lumpectomy, which removes only the tumor and a margin of surrounding tissue while preserving most of the breast. The choice between lumpectomy and mastectomy depends on tumor size, location, cancer characteristics, and patient preference. Breast reconstruction is an option for those who have a mastectomy.

Can lifestyle changes reduce my risk of breast cancer?

While you cannot eliminate breast cancer risk entirely, certain lifestyle choices may help reduce it. Maintaining a healthy weight, exercising regularly, limiting alcohol consumption, and avoiding tobacco are associated with lower risk. Breastfeeding and limiting hormone therapy may also reduce risk. However, even with healthy habits, screening remains important.

What is triple-negative breast cancer?

Triple-negative breast cancer is a type that tests negative for estrogen receptors, progesterone receptors, and excess HER2 protein. This means it does not respond to hormonal therapies or drugs that target HER2. It tends to grow faster and has fewer targeted treatment options, but chemotherapy and newer immunotherapy approaches can be effective.