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What is Breast Cancer? Definition and Overview

Understand what breast cancer is with our comprehensive definition and overview. Learn about its origins, common types, risk factors, and the importance of early detection for effective treatment and improved outcomes.

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Written by Dr. Mohammed Kamran

Reviewed by Dr. Vasanthasree Nair MBBS

Last updated on 12th Aug, 2025

breast cancer

Breast cancer is a type of cancer that develops in the cells of the breast. It occurs when abnormal cells grow uncontrollably, forming a tumor that can sometimes spread to other parts of the body. While breast cancer is more common in women, men can also develop it, though it is rare.

Understanding breast cancer is crucial because early detection and treatment can significantly improve outcomes. This article will help you learn about breast cancer in simple terms—what it is, its symptoms, causes, and ways to manage or prevent it.

How Does Breast Cancer Develop?

Our bodies are made up of tiny building blocks called cells. Normally, cells grow, divide, and die in a controlled way. But sometimes, due to genetic changes or other factors, these cells start multiplying uncontrollably, forming a lump or tumor.

Breast cancer usually begins in the milk producing glands (lobules) or the ducts that carry milk to the nipple. If not detected early, cancer cells can spread to nearby lymph nodes or other organs—a process called metastasis.

Common Symptoms of Breast Cancer

Not all breast lumps are cancerous, but it’s important to be aware of possible warning signs, which may include:

  • A lump or thickening in the breast or underarm area
  • Changes in breast size or shape
  • Nipple discharge (other than breast milk)
  • Nipple turning inward (inversion)
  • Redness, dimpling, or puckering of the skin (like an orange peel)
  • Persistent pain in the breast or nipple

If you notice any of these changes, consult a doctor. Early detection can make treatment more effective.

What Causes Breast Cancer?

The exact cause of breast cancer is not always clear, but certain risk factors increase the chances of developing it:

1. Age & Gender

  • Women over 50 are at higher risk.
  • Being female increases risk, but men can also develop breast cancer.
     

2. Family History & Genetics

  • Having close relatives (mother, sister, daughter) with breast cancer raises risk.
  • Inherited gene mutations like BRCA1 and BRCA2 can increase likelihood.
     

3. Hormonal Factors

  • Early menstruation (before age 12) or late menopause (after 55).
  • Long Term use of hormone replacement therapy (HRT).
     

4. Lifestyle Factors

  • Obesity (especially after menopause).
  • Alcohol consumption (more than one drink per day).
  • Lack of physical activity.
     

5. Radiation Exposure

  • Previous radiation therapy to the chest area may increase risk.

How is Breast Cancer Diagnosed?

If you notice any unusual changes, your doctor may recommend:

1. Clinical Breast Exam – A physical check for lumps or abnormalities.
2. Mammogram – An X Ray of the breast to detect tumors.
3. Ultrasound or MRI – Helps distinguish between solid lumps and fluid filled cysts.
4. Biopsy – Removing a small tissue sample to test for cancer cells.

Early detection through regular self exams and mammograms can save lives.

Treatment Options for Breast Cancer

Treatment depends on the cancer type, stage, and overall health. Common approaches include:

  • Surgery – Removing the tumor (lumpectomy) or the entire breast (mastectomy).
  • Radiation Therapy – Using high energy rays to kill cancer cells.
  • Chemotherapy – Drugs to destroy fast growing cancer cells.
  • Hormone Therapy – Blocks hormones that fuel certain breast cancers.
  • Targeted Therapy – Drugs that attack specific cancer cell features.

Your doctor will create a personalized plan based on your condition.

How Can You Reduce the Risk of Breast Cancer?

While some risk factors (like genetics) can’t be changed, you can lower your risk with healthy habits:

  • Maintain a Healthy Weight – Obesity increases risk, especially after menopause.
  • Stay Active – Aim for at least 30 minutes of exercise most days.
  • Limit Alcohol – Stick to one drink per day or less.
  • Breastfeed if Possible – Reduces risk for some women.
  • Avoid Smoking – Smoking is linked to many cancers, including breast cancer.
  • Get Regular Screenings – Mammograms help detect cancer early.

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

68 Cashback

450

No Booking Fees

Dr. Sujay P R, General Physician/ Internal Medicine Specialist

Dr. Sujay P R

General Physician/ Internal Medicine Specialist

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

40 Cashback

Dr. Karan Goel, General Physician/ Internal Medicine Specialist

Dr. Karan Goel

General Physician/ Internal Medicine Specialist

11 Years • MBBS, MD (Paediatrics)

Kolkata

Little Steps Clinic, Kolkata

500

Dr Sravani Kuppam, General Physician/ Internal Medicine Specialist

Dr Sravani Kuppam

General Physician/ Internal Medicine Specialist

12 Years • MBBS DNB General Medicine, CCDM (Diabetes)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

55 Cashback

Dr. Poonam Bhagat, General Physician/ Internal Medicine Specialist

Dr. Poonam Bhagat

General Physician/ Internal Medicine Specialist

20 Years • MBBS, MD

Kolkata

KVC CLINIC, Kolkata

recommendation

95%

(50+ Patients)

930

900

When Should You See a Doctor?

If you notice any unusual changes in your breasts, don’t wait—schedule an appointment with a doctor. Early detection is key to successful treatment.

If you have a family history of breast cancer, consider genetic counseling to assess your risk.

Final Thoughts

Breast cancer is a serious condition, but with awareness, early detection, and advances in treatment, many people survive and lead healthy lives. Knowing the signs, staying proactive with screenings, and adopting a healthy lifestyle can make a big difference.

If you have concerns or need a consultation, Apollo 24|7 offers expert care and convenient booking for mammograms and doctor visits. Your health matters—take the first step today.

Would you like to schedule a check up or learn more? Visit Apollo 24|7 for support and guidance.

Stay informed, stay healthy! 

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

68 Cashback

450

No Booking Fees

Dr. Sujay P R, General Physician/ Internal Medicine Specialist

Dr. Sujay P R

General Physician/ Internal Medicine Specialist

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

40 Cashback

Dr. Karan Goel, General Physician/ Internal Medicine Specialist

Dr. Karan Goel

General Physician/ Internal Medicine Specialist

11 Years • MBBS, MD (Paediatrics)

Kolkata

Little Steps Clinic, Kolkata

500

Dr Sravani Kuppam, General Physician/ Internal Medicine Specialist

Dr Sravani Kuppam

General Physician/ Internal Medicine Specialist

12 Years • MBBS DNB General Medicine, CCDM (Diabetes)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

55 Cashback

Dr. Poonam Bhagat, General Physician/ Internal Medicine Specialist

Dr. Poonam Bhagat

General Physician/ Internal Medicine Specialist

20 Years • MBBS, MD

Kolkata

KVC CLINIC, Kolkata

recommendation

95%

(50+ Patients)

930

900

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

68 Cashback

450

No Booking Fees

Dr. Sujay P R, General Physician/ Internal Medicine Specialist

Dr. Sujay P R

General Physician/ Internal Medicine Specialist

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

40 Cashback

Dr. Karan Goel, General Physician/ Internal Medicine Specialist

Dr. Karan Goel

General Physician/ Internal Medicine Specialist

11 Years • MBBS, MD (Paediatrics)

Kolkata

Little Steps Clinic, Kolkata

500

Dr Sravani Kuppam, General Physician/ Internal Medicine Specialist

Dr Sravani Kuppam

General Physician/ Internal Medicine Specialist

12 Years • MBBS DNB General Medicine, CCDM (Diabetes)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

55 Cashback

Dr. Poonam Bhagat, General Physician/ Internal Medicine Specialist

Dr. Poonam Bhagat

General Physician/ Internal Medicine Specialist

20 Years • MBBS, MD

Kolkata

KVC CLINIC, Kolkata

recommendation

95%

(50+ Patients)

930

900

Consult Top Specialists

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

68 Cashback

450

No Booking Fees

Dr. Sujay P R, General Physician/ Internal Medicine Specialist

Dr. Sujay P R

General Physician/ Internal Medicine Specialist

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

40 Cashback

Dr. Karan Goel, General Physician/ Internal Medicine Specialist

Dr. Karan Goel

General Physician/ Internal Medicine Specialist

11 Years • MBBS, MD (Paediatrics)

Kolkata

Little Steps Clinic, Kolkata

500

Dr Sravani Kuppam, General Physician/ Internal Medicine Specialist

Dr Sravani Kuppam

General Physician/ Internal Medicine Specialist

12 Years • MBBS DNB General Medicine, CCDM (Diabetes)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

55 Cashback

Dr. Poonam Bhagat, General Physician/ Internal Medicine Specialist

Dr. Poonam Bhagat

General Physician/ Internal Medicine Specialist

20 Years • MBBS, MD

Kolkata

KVC CLINIC, Kolkata

recommendation

95%

(50+ Patients)

930

900

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