Skip to main navigation Skip to main content Skip to footer For Medicare For Providers For Brokers For Employers Español For Individuals & Families: For Individuals & Families Medical Dental Other Supplemental Explore coverage through work How to Buy Health Insurance Types of Dental Insurance Open Enrollment vs. Special Enrollment See all topics Shop for Medicare plans Member Guide Find a Doctor Log in to myCigna
Home Knowledge CenterBreast Cancer Symptoms, Causes, and Treatment

Breast Cancer Symptoms, Causes, and Treatment

Breast cancer affects the lives of many. Find out more about its causes, symptoms, and treatments.

What is breast cancer?

Breast cancer is when abnormal cells grow in 1 or both breasts and develop a mass called a malignant tumor. Those cancer cells can then spread to lymph nodes and other parts of the body.

Breast cancer is the most common cancer in American women, after skin cancer—1 in 8 American women will develop breast cancer (12 percent risk rate).1 Currently, there is no way to prevent breast cancer.

What are the causes of breast cancer?

Breast cancer causes are unknown, but there are some risk factors (such as being overweight and lack of physical activity) that may increase the chances of getting breast cancer. However, these risk factors are not always the best indicator of whether someone will get the disease.

What are some common breast cancer symptoms?

  • Change in way the breast feels: The most common symptom of breast cancer is a painless lump or thickening of the breast.
  • Change in the way the breast looks: Skin may look different, or you may see a change in size or shape.
  • Change in the nipple: It may turn in or the skin around it becomes scaly.
  • Fluid comes out of the nipple (other than breast milk).

How is breast cancer diagnosed?

The following types of breast cancer screening can help doctors diagnose breast cancer:

  • You can sometimes detect lumps through breast self-exams.
  • Your primary care doctor can check for lumps during your physical exams.
  • Your doctor can also refer you to get a mammogram—an x-ray of the breast that can find smaller lumps that may be undetectable by touch. If a lump or other change is detected, the doctor will take sample of cells in the breast—this is a biopsy. Results of the biopsy can determine whether cells are cancerous.

What is the treatment for breast cancer?

Breast cancer treatment options are based on:

  • Type and stage of the cancer
  • Chances that the type of treatment will cure the cancer or help
  • Your age
  • Other health problems
  • Feelings about side effects for certain treatments

Treatment for breast cancer often includes surgery, radiation therapy, chemotherapy, hormone therapy, or targeted therapy.

More Information

Learn more about breast cancer screening by calling the American Cancer Society at or visiting their website .


Cancer Screening


What is Medicare? Choosing a Medicare Plan Preventive Care for Seniors Health Care as We Get Older

Back to Knowledge Center

1 How Common is Breast Cancer?, American Cancer Society, March 7, 2021,

Page Footer

I want to...

Get an ID card File a claim View my claims and EOBs Check coverage under my plan See prescription drug list Find an in-network doctor, dentist, or facility Find a form Find 1095-B tax form information View the Cigna Glossary Contact Cigna


Individuals and Families Medicare Employers Brokers Providers

Secure Member Sites

myCigna member portal Health Care Provider portal Cigna for Employers Client Resource Portal Cigna for Brokers

The Cigna Group Information

About The Cigna Group Company Profile Careers Newsroom Investors Suppliers The Cigna Group Third Party Administrators International Evernorth

 Cigna. All rights reserved.

Privacy Legal Product Disclosures Cigna Company Names Customer Rights Accessibility Non-Discrimination Notice Language Assistance [PDF] Report Fraud Sitemap


Individual and family medical and dental insurance plans are insured by Cigna Health and Life Insurance Company (CHLIC), Cigna HealthCare of Arizona, Inc., Cigna HealthCare of Illinois, Inc., Cigna HealthCare of Georgia, Inc., Cigna HealthCare of North Carolina, Inc., Cigna HealthCare of South Carolina, Inc., and Cigna HealthCare of Texas, Inc. Group health insurance and health benefit plans are insured or administered by CHLIC, Connecticut General Life Insurance Company (CGLIC), or their affiliates (see a listing of the legal entities that insure or administer group HMO, dental HMO, and other products or services in your state). Accidental Injury, Critical Illness, and Hospital Care plans or insurance policies are distributed exclusively by or through operating subsidiaries of Cigna Corporation, are administered by Cigna Health and Life Insurance Company, and are insured by either (i) Cigna Health and Life Insurance Company (Bloomfield, CT); (ii) Life Insurance Company of North America (“LINA”) (Philadelphia, PA); or (iii) New York Life Group Insurance Company of NY (“NYLGICNY”) (New York, NY), formerly known as Cigna Life Insurance Company of New York. The Cigna name, logo, and other Cigna marks are owned by Cigna Intellectual Property, Inc. LINA and NYLGICNY are not affiliates of Cigna.

All insurance policies and group benefit plans contain exclusions and limitations. For availability, costs and complete details of coverage, contact a licensed agent or Cigna sales representative. This website is not intended for residents of New Mexico.

Selecting these links will take you away from to another website, which may be a non-Cigna website. Cigna may not control the content or links of non-Cigna websites. Details