Breast Cancer: Symptoms, Risk Factors, Screening and Treatment

Educational information, not medical advice. See our Medical Disclaimer. Last updated: October 27, 2026.

Breast cancer is a disease in which abnormal cells in the breast grow uncontrollably. Understanding possible symptoms, risk factors, screening and treatment can help people make informed decisions and seek medical advice when something changes. Breast cancer mainly affects women, but men can develop it too. This article is for general education and does not replace advice from a qualified healthcare professional.

What Is Breast Cancer?

Breast cancer develops when cells in breast tissue begin to grow abnormally. It often starts in milk ducts or milk-producing lobules. Some cancers remain confined to their original location, while invasive cancers can grow into nearby tissue and may spread to lymph nodes or other parts of the body. The type and extent of the cancer help clinicians decide which treatments are appropriate.

A breast lump does not automatically mean cancer: many lumps are caused by non-cancerous conditions. However, a new lump or an unusual change should be assessed by a healthcare professional rather than diagnosed at home. Early evaluation can help identify the cause and, when cancer is present, support timely treatment.

Common Signs and Symptoms

Breast cancer does not always cause noticeable symptoms in its early stages, which is one reason recommended screening matters. Possible warning signs include:

• A new lump or thickened area in the breast or armpit.
• A change in the size, shape or appearance of a breast.
• Dimpling, puckering, swelling, redness, darkening or a texture change in the skin.
• A nipple that becomes newly inverted or changes appearance.
• Nipple discharge that is not breast milk, particularly if it is bloody.
• Persistent or unusual changes around the nipple or areola.

These signs can also have causes other than cancer. Arrange a medical assessment promptly if you notice a new or persistent change, even if it is painless or you recently had a normal mammogram. Do not wait for a routine screening appointment to investigate a symptom.

Breast Cancer Risk Factors

Risk is influenced by a combination of factors. Getting older and being female are important risk factors, but anyone with breast tissue can develop breast cancer. Other factors associated with increased risk include:

• A close relative with breast cancer or certain inherited gene changes, including BRCA1 and BRCA2.
• A personal history of breast cancer or certain breast conditions.
• Previous radiation treatment to the chest, especially at a young age.
• Dense breast tissue, which can also make some cancers harder to see on a mammogram.
• Alcohol consumption, excess body weight after menopause, and some forms of menopausal hormone therapy.
• Reproductive and hormonal factors, such as starting periods at an early age or reaching menopause later.

Having one or more risk factors does not mean someone will develop breast cancer, and many people diagnosed with the disease have no known family history. If several close relatives have had breast or ovarian cancer, or a relative was diagnosed at a young age, ask a clinician whether a formal risk assessment or genetic counselling may be appropriate.

Screening and Early Detection

Screening looks for cancer before symptoms appear. Mammography, an X-ray examination of the breast, is the standard screening test for many people at average risk. The recommended starting age and frequency vary by country, age, personal history and risk level, so follow the guidance of your local health service and discuss individual circumstances with a clinician.

Knowing what is normal for your breasts can help you notice changes. Awareness is not a substitute for screening when screening is recommended, and checking your breasts yourself cannot reliably rule out cancer. If you find a change, seek medical advice even if you have recently had a normal screening result.

How Is Breast Cancer Diagnosed?

If symptoms or a screening result need further investigation, a clinician may review your medical and family history and examine the breast and armpit. Depending on the findings, tests may include diagnostic mammography, ultrasound or, in selected situations, MRI. A biopsy, in which a small tissue sample is examined in a laboratory, is often needed to confirm whether cancer is present.

When cancer is confirmed, laboratory tests can identify features such as hormone-receptor status and HER2 status. These results, together with the cancer’s size, location and whether it has spread, help the care team plan treatment. Your clinician should explain what each test means and whether further investigations are needed.

Breast Cancer Treatment Options

Treatment is individualised. It depends on the cancer’s type and stage, test results, overall health, personal preferences and the likely benefits and side effects of each option. Treatment may involve one approach or a combination of the following:

• Surgery: an operation to remove the tumour, or sometimes the breast, with decisions based on the clinical situation.
• Radiotherapy: targeted high-energy radiation used to destroy cancer cells and reduce the risk of local recurrence in appropriate cases.
• Hormone therapy: medicines for cancers that use oestrogen or progesterone signals to grow.
• Chemotherapy: medicines that kill or slow the growth of cancer cells; whether it is needed depends on the cancer and its risk profile.
• Targeted therapy and immunotherapy: treatments that may be suitable for certain cancer subtypes.

Ask the specialist to explain the goal of treatment, expected benefits, possible side effects, fertility or menopause considerations where relevant, and what support services are available. A second opinion can be reasonable if you want more clarity about a major treatment decision.

Can Breast Cancer Risk Be Reduced?

There is no guaranteed way to prevent breast cancer, and some risk factors cannot be changed. Helpful steps may include limiting or avoiding alcohol, staying physically active, maintaining a weight that is healthy for you, and discussing the benefits and risks of hormone therapy with a clinician. People at substantially increased inherited risk may be offered additional screening or preventive options after specialist assessment.

Healthy habits support overall wellbeing, but they cannot replace screening or medical assessment. Be cautious of products or online claims promising to prevent or cure cancer without reliable evidence. Do not stop prescribed treatment or delay recommended investigations because of a supplement, diet or alternative remedy.

Living With a Breast Cancer Diagnosis

A diagnosis can bring uncertainty, fear and practical challenges. Support may come from the oncology team, a counsellor, a trusted friend or family member, or a reputable patient support organisation. Before appointments, write down questions and consider bringing someone you trust. Ask about emotional support, rehabilitation, financial guidance and follow-up care if these would help.

Everyone’s experience is different. Treatment and recovery can take time, and it is reasonable to ask for information in plain language or request an interpreter. If you are supporting someone with breast cancer, listening, respecting their choices and offering practical help can be valuable.

Frequently Asked Questions

Does a breast lump always mean cancer?

No. Many breast lumps are benign, but a new lump should be assessed by a healthcare professional because touch alone cannot reliably determine its cause.

Can men develop breast cancer?

Yes. Breast cancer in men is uncommon, but a new lump, nipple change or discharge should still be checked promptly.

Is breast pain a sign of cancer?

Breast pain alone is not usually a sign of breast cancer, and many non-cancerous conditions can cause it. Persistent pain or pain accompanied by a lump or other unusual change deserves medical advice.

At what age should screening begin?

There is no single schedule that suits everyone. Recommendations differ between countries and depend on age and personal risk. Check your local screening programme and ask a clinician about your individual situation.

Key Takeaway

Understanding breast cancer symptoms, risk factors and screening can help people act on changes and make informed healthcare decisions. Seek prompt medical advice for a new lump or other unusual breast or nipple change, and follow personalised screening guidance. Diagnosis and treatment decisions should always be made with qualified healthcare professionals.

Sources and Further Reading

• World Health Organization: Breast cancer
• National Cancer Institute: Signs and Symptoms of Breast Cancer
• National Cancer Institute: Breast Cancer Causes and Risk Factors
• National Cancer Institute: How Is Breast Cancer Diagnosed?
• NHS: Symptoms of breast cancer in women

Author and Medical Sources

Editorial source: World Health Organization (WHO), “Breast cancer” fact sheet. This article is an educational summary and is not written or medically reviewed by a named doctor. It should be reviewed by a qualified healthcare professional before being treated as clinical guidance.

Read the WHO breast cancer fact sheet.

Medical disclaimer: This article is for educational purposes only. It does not provide a diagnosis or personalised medical advice and should not replace consultation with a qualified healthcare professional.