Breast cancer is one of the most common cancers affecting women worldwide, though men can develop it too. Early detection, awareness, and understanding of risk factors can significantly improve outcomes. This guide provides a thorough overview of breast cancer — from types and symptoms to treatment options and prevention.
What Is Breast Cancer?
Breast cancer occurs when cells in the breast grow uncontrollably, forming a tumor that can often be felt as a lump or detected on an imaging scan. It originates most commonly in the milk ducts or lobules of the breast.
Types of Breast Cancer
| Type | Description | Common? |
| Ductal Carcinoma In Situ (DCIS) | Non-invasive cancer confined to the milk ducts | Very common |
| Invasive Ductal Carcinoma (IDC) | Spreads beyond ducts into surrounding tissue | Most common (~80%) |
| Invasive Lobular Carcinoma (ILC) | Starts in lobules and spreads to nearby tissue | Common |
| Triple-Negative Breast Cancer | Lacks estrogen, progesterone, HER2 receptors | Aggressive, harder to treat |
| HER2-Positive Breast Cancer | Overexpresses the HER2 protein | Fast-growing but targeted therapies available |
| Inflammatory Breast Cancer (IBC) | Rare, aggressive, causes redness and swelling | Rare (~1–5%) |
Signs and Symptoms
Symptoms can vary, but common warning signs include:
- A new lump or mass in the breast or underarm
- Swelling of part or all of the breast
- Skin dimpling or puckering (resembling an orange peel)
- Redness, scaliness, or thickening of the nipple or breast skin
- Nipple discharge other than breast milk
- Pain in any area of the breast
- Changes in breast size or shape
Risk Factors
Non-Modifiable Risk Factors
- Being female and over age 50
- Family history of breast or ovarian cancer
- Inherited gene mutations (BRCA1, BRCA2)
- Dense breast tissue
- Previous breast cancer diagnosis
Modifiable Risk Factors
- Excessive alcohol consumption
- Obesity, especially after menopause
- Sedentary lifestyle
- Long-term hormone replacement therapy (HRT)
- Smoking
Diagnosis
Breast cancer is diagnosed through a combination of:
- Mammogram – X-ray of the breast (screening tool)
- Ultrasound – distinguishes solid masses from fluid-filled cysts
- MRI – provides detailed images of the breast
- Biopsy – confirms cancer and determines its type and stage
Staging
| Stage | Description |
| Stage 0 | Non-invasive (DCIS); cancer confined to ducts |
| Stage I | Small tumor (<2cm), no lymph node involvement |
| Stage II | Larger tumor or limited lymph node spread |
| Stage III | Extensive lymph node involvement or local spread |
| Stage IV | Metastatic — spread to distant organs (lungs, liver, bones, brain) |
Treatment Options
Surgical Options
- Lumpectomy – removes only the tumor and surrounding tissue
- Mastectomy – removes one or both breasts
- Sentinel lymph node biopsy – checks if cancer has spread
Non-Surgical Treatments
- Radiation therapy – targets and destroys remaining cancer cells
- Chemotherapy – uses drugs to kill fast-growing cells
- Hormone therapy – blocks estrogen/progesterone in hormone-sensitive cancers
- Targeted therapy – targets specific proteins like HER2
- Immunotherapy – helps the immune system recognize and fight cancer
Prevention Tips
- Maintain a healthy weight with regular exercise
- Limit alcohol to no more than one drink per day
- Breastfeed if possible
- Avoid long-term hormone therapy when possible
- Get regular mammograms as recommended by your doctor
- Know your family history and consider genetic testing if at risk
When to See a Doctor
See your doctor immediately if you notice any new lump, skin change, nipple discharge, or persistent pain in the breast. Early detection dramatically improves survival rates. Routine mammograms are recommended for women 40 and older, or earlier if you have high-risk factors.
Dr. Niraj Sharma is an accomplished physician who has built a distinguished career at the intersection of internal medicine, pediatrics, and academic medicine.