Breast Cancer in Women Types, Causes, Symptoms, Diagnosis, and Treatments

Abstract

Breast cancer is one of the most common cancers in women globally and remains a major cause of cancer-related death. Despite the seriousness of the disease, early detection and modern treatments have significantly improved outcomes. This article offers a clear and structured guide to understanding female breast cancer. It explains what breast cancer is, the various types and stages, how it is diagnosed, the causes and risk factors involved, and available treatment options including surgery, radiation, chemotherapy, hormone therapy, immunotherapy, and targeted therapy. It also covers how breast cancer spreads, how it differs from benign lumps, how to manage treatment side effects, and what to expect after diagnosis. Special attention is given to supportive care, prognosis, and everyday life while living with the disease. This is part of the 'Public Education Series' initiative by Exon Publications.

Cite as: Breast Cancer in Women: Types, Causes, Symptoms, Diagnosis, and Treatments. Brisbane (AU): Exon Publications; 2025. Published on  03 May. DOI: https://doi.org/10.36255/breast-cancer-women-types-causes-symptoms-diagnosis-treatments

Introduction

Breast cancer is a disease in which abnormal cells in the breast tissue grow out of control. It can affect both males and females, but this article focuses on breast cancer in females, where it is far more common (For those interested in learning about breast cancer in men, we have a separate article dedicated to the topic male breast cancer). Awareness, early diagnosis, and timely treatment have all contributed to reducing deaths from the disease. Understanding the basics of breast cancer helps create confidence when navigating through screening, treatment, and recovery. This article covers each of these aspects in detail using clear and simple language (1-5).

Breast cancer develops when normal cells in the breast begin to change and grow without control. These cells can form a mass or lump, which may be detected during a physical examination, mammogram, or other imaging test. Image: Breast Cancer Pink Ribbon Concept. Image Credit: pixelshot via Canva.com

What is Breast Cancer?

Breast cancer develops when normal cells in the breast begin to change and grow without control. These cells can form a mass or lump, which may be detected during a physical examination, mammogram, or other imaging test. Cancer can start in different parts of the breast, including the ducts that carry milk, the lobules that produce milk, or the surrounding tissue. While some tumors remain confined to one area, others can grow aggressively and spread to nearby tissues or organs. Early detection of these changes is critical because cancer found in its early stages is usually easier to treat and more likely to result in a good outcome.

What are the Types of Breast Cancer?

There are different types of breast cancer, and knowing the type helps guide treatment. The most common type is invasive ductal carcinoma, which starts in the milk ducts and spreads to surrounding tissue. Invasive lobular carcinoma starts in the lobules and can also spread. Other types include ductal carcinoma in situ, which is considered non-invasive but may become invasive over time if left untreated. Some less common forms include inflammatory breast cancer, which can cause swelling and redness, and triple-negative breast cancer, which does not respond to hormone-based treatments. Doctors may also describe breast cancer based on its hormone receptor status or whether it is HER2-positive. Each of these details influences the treatment plan and expected response to therapy.

What are the Signs and Symptoms of Breast Cancer?

The most common early sign of breast cancer is a new lump or thickening in the breast or underarm area. Other possible symptoms include changes in the size or shape of the breast, dimpling or puckering of the skin, nipple discharge that is not breast milk, or a nipple that turns inward. Some women may also notice redness, scaling, or swelling of part of the breast. These symptoms do not always mean cancer, but any persistent change should be checked by a doctor as soon as possible.

What are the Causes and Risk Factors for Breast Cancer?

The exact cause of breast cancer is not always known, but several risk factors increase the likelihood of developing it. Age is one of the most significant risk factors, with most cases occurring in women over the age of 50. Family history and inherited genetic mutations such as BRCA1 and BRCA2 can also raise the risk significantly. Other factors include early menstruation, late menopause, not having children or having them later in life, and prolonged use of hormone replacement therapy. Lifestyle habits such as drinking alcohol, being overweight, lack of physical activity, and smoking may also play a role. However, even women without these risk factors can develop breast cancer, and many with risk factors never do. This is why regular screening is important for everyone, not just those at higher risk.

How is Breast Cancer Diagnosed?

Breast cancer is diagnosed through a combination of physical examination, imaging tests, and biopsy. The first step is often a screening mammogram, which uses low-dose X-rays to detect abnormalities. If something suspicious is seen, an ultrasound or magnetic resonance imaging scan may be performed to look more closely at the area. If needed, a biopsy is done by removing a small sample of breast tissue with a needle or during a minor surgical procedure. This sample is examined under a microscope to determine whether cancer cells are present and, if so, what type they are. Additional tests may be carried out to check for hormone receptors or HER2 proteins, which help doctors decide on the most effective treatment.

What are the Stages and Grades of Breast Cancer?

Staging describes how far breast cancer has spread, and it plays a crucial role in planning treatment. Stage 0 means the cancer is still in its original place and has not invaded nearby tissue. Stage 1 indicates a small tumor that has begun to grow but has not spread far. Stage 2 and 3 show increasing tumor size and potential involvement of nearby lymph nodes. Stage 4, also known as metastatic breast cancer, means the cancer has spread to distant organs such as the bones, liver, lungs, or brain. In addition to staging, the grade of the tumor describes how different the cancer cells look from normal cells. High-grade tumors tend to grow faster and may require more aggressive treatment, while low-grade tumors are often slower growing.

What are the Differences Between Benign and Malignant Breast Cancer?

Not all lumps in the breast are cancerous. Benign breast conditions include cysts, fibroadenomas, and other non-cancerous growths. These do not spread to other parts of the body and are usually not life-threatening. Malignant breast cancer, on the other hand, involves abnormal cell growth that can invade nearby tissue and spread to other areas. While benign lumps can cause discomfort or changes in breast appearance, they typically do not require extensive treatment. Proper diagnosis using imaging and biopsy is essential to distinguish between benign and malignant findings.

What is Metastatic Breast Cancer?

Metastatic breast cancer, also called Stage 4 breast cancer, means the cancer has spread beyond the breast and nearby lymph nodes to distant parts of the body. Common sites include the bones, liver, lungs, and brain. Although metastatic cancer is not considered curable, many women live for several years with the condition. Treatment focuses on controlling the disease, relieving symptoms, and improving quality of life. Options may include ongoing medication, clinical trials, or palliative care, depending on how the cancer behaves over time.

How does Breast Cancer Spread?

Breast cancer spreads when cancer cells break away from the original tumor and travel through the blood or lymphatic system to other parts of the body. The first place it often spreads is to the lymph nodes under the arm. From there, it can move to bones, lungs, liver, or brain. The speed and pattern of spread depend on the type of breast cancer, how aggressive it is, and how early it is detected. That is why regular monitoring and early treatment are essential in managing the disease effectively.

What are the Treatment Options for Breast Cancer?

There are several ways to treat breast cancer, and the choice depends on the stage, type, and characteristics of the tumor. Most women receive more than one kind of treatment. Surgery, radiation, chemotherapy, hormone therapy, targeted therapy, and immunotherapy are all used either alone or in combination. Some treatments are local, like surgery and radiation, which target the tumor directly. Others are systemic, like chemotherapy and hormone therapy, which travel through the whole body to reach cancer cells. Doctors consider each woman’s needs and preferences when designing a personalized treatment plan.

Surgery for Breast Cancer

Surgery is often the first treatment for breast cancer. It may involve removing just the tumor and a small margin of healthy tissue, called a lumpectomy, or removing the entire breast, called a mastectomy. Sometimes both breasts are removed to lower the risk of recurrence, especially in women with BRCA mutations. Nearby lymph nodes may also be removed during surgery to check for spread. Recovery from surgery varies based on the extent of the procedure and any additional treatments that follow.

Chemotherapy for Breast Cancer

Chemotherapy uses powerful drugs to destroy cancer cells or slow their growth. It is often given before surgery to shrink the tumor or after surgery to kill any remaining cancer cells. It may also be used for advanced breast cancer that has spread to other parts of the body. Chemotherapy drugs are usually given through a vein in cycles over several weeks or months. While it can be effective, chemotherapy can also cause side effects such as fatigue, nausea, hair loss, and increased risk of infection.

Hormone Therapy for Breast Cancer

Hormone therapy is used for breast cancers that are sensitive to estrogen or progesterone. These treatments work by blocking the body’s ability to produce or use these hormones. Common medications include tamoxifen and aromatase inhibitors. Hormone therapy is usually taken as a daily pill for several years after surgery to lower the risk of cancer returning. It may also be used for advanced breast cancer. Side effects can include hot flashes, joint pain, and bone thinning, but many women tolerate the treatment well with proper monitoring.

Radiation Therapy for Breast Cancer

Radiation therapy uses high-energy beams to destroy cancer cells in the breast or surrounding tissues. It is usually given after surgery to kill any remaining cancer cells and reduce the risk of recurrence. Treatment is typically delivered five days a week over several weeks. Common side effects include fatigue and skin irritation, but these usually go away after treatment ends. Radiation is an important part of therapy, especially after a lumpectomy, to ensure the area is fully treated.

Immunotherapy for Breast Cancer

Immunotherapy helps the body’s immune system recognize and attack cancer cells. It is used in some types of advanced or triple-negative breast cancer. Drugs like checkpoint inhibitors block proteins that prevent the immune system from working properly. This allows immune cells to better detect and destroy cancer. Immunotherapy is usually given through an IV and may be combined with chemotherapy. It is not suitable for all types of breast cancer, but ongoing research is expanding its use.

Targeted Therapy for Breast Cancer

Targeted therapy focuses on specific genes or proteins that are involved in cancer growth. One example is HER2-targeted therapy, which is used in cancers that produce too much of the HER2 protein. Drugs like trastuzumab bind to this protein and stop the cancer cells from growing. These treatments are often used alongside chemotherapy or hormone therapy and can be very effective. Because they target cancer cells more precisely, they tend to have fewer side effects than traditional chemotherapy.

Managing Side Effects of Breast Cancer Treatments

Side effects from breast cancer treatments vary depending on the therapy used. Common issues include fatigue, nausea, hair loss, skin changes, and changes in appetite. Some women may also experience emotional challenges like anxiety or depression. Managing side effects is a key part of the overall treatment plan. Doctors may prescribe medications, recommend dietary changes, or refer women to support services to help them cope. Staying active, eating well, and asking for help when needed can make a big difference during treatment.

Supportive Care for Breast Cancer

Supportive care includes services that help improve comfort and quality of life during and after treatment. This can involve pain management, physical therapy, counseling, nutritional support, and help with side effects. Support groups and patient education resources also play an important role. Having a supportive care team helps women navigate the physical and emotional challenges of breast cancer more easily and improves their overall experience.

Palliative Care for Breast Cancer

Palliative care is specialized medical care for people living with serious illnesses like cancer. It focuses on relief from symptoms, pain, and stress, regardless of the stage of the disease. For women with advanced or metastatic breast cancer, palliative care may be offered alongside active treatment to enhance comfort and daily functioning. It also supports emotional and spiritual needs, helping patients and families make informed decisions about care.

Prognosis and Survival Rate for Breast Cancer

The prognosis for breast cancer depends on several factors, including the stage at diagnosis, tumor type, and response to treatment. When detected early, the five-year survival rate can be over 90 percent. Even for advanced cases, treatment options continue to improve, and many women live meaningful lives for many years. Regular follow-up care, healthy lifestyle habits, and emotional support all contribute to better long-term outcomes.

Living with Breast Cancer

Living with breast cancer involves adapting to both short-term and long-term changes. Some women continue to work and maintain normal activities during treatment, while others take time off to rest and recover. Emotional support from family, friends, and care teams is essential. As treatment ends, regular monitoring helps catch any signs of recurrence early. Many women also find new purpose or perspective after surviving cancer and become advocates or mentors for others facing the disease.

Common FAQs and Answers about Breast Cancer
Can breast cancer return after a mastectomy?

Yes, breast cancer can return after a mastectomy, although the risk is lower. Recurrence may happen in the chest wall or nearby lymph nodes and is called local or regional recurrence. Regular follow-up exams and imaging help detect any changes early.

What is the difference between triple-negative and hormone-positive breast cancer?

Triple-negative breast cancer lacks estrogen, progesterone, and HER2 receptors, making it harder to treat with common therapies. Hormone-positive breast cancers grow in response to hormones and are treated with hormone-blocking medications, which are not effective for triple-negative cases.

How do dense breasts affect breast cancer detection?

Women with dense breasts have more fibrous and glandular tissue, which can make it harder to see tumors on a mammogram. Dense breast tissue is also linked to a slightly higher risk of developing breast cancer. Additional imaging, like ultrasound or MRI, may be recommended.

Is it safe to get pregnant after breast cancer treatment?

Many women can safely become pregnant after treatment, especially if their cancer was caught early and they have completed therapy. It is important to wait the recommended time, often two to five years, and discuss plans with a healthcare provider.

Are breast implants linked to breast cancer risk?

Breast implants are not linked to typical breast cancer, but certain textured implants have been associated with a rare type of lymphoma called BIA-ALCL. This is extremely rare and not considered a breast cancer but should still be discussed with a plastic surgeon.

Can breast cancer be painful in the early stages?

In most cases, early-stage breast cancer does not cause pain. A painless lump or thickening in the breast is often the first sign. However, some women do report tenderness or discomfort, especially if the tumor is growing near nerves or the skin. Any new or persistent breast pain should be evaluated by a doctor, even if it is not typically linked to cancer.

How often should women get a mammogram?

For women with average risk, most guidelines recommend starting screening mammograms every two years from age 50 to 74. Some women may begin earlier at age 40 based on personal or family history. Women at higher risk, such as those with BRCA mutations, may need more frequent or earlier screening, often including MRI scans in addition to mammograms.

Can diet and lifestyle reduce breast cancer risk?

While no diet can completely prevent breast cancer, certain habits can lower your risk. Maintaining a healthy weight, limiting alcohol intake, staying physically active, and eating a balanced diet rich in fruits, vegetables, and whole grains may help. Quitting smoking and avoiding hormone replacement therapy unless necessary can also contribute to a lower risk.

Is breast cancer always hereditary?

No, most cases of breast cancer are not inherited. Only about 5 to 10 percent of breast cancers are linked to inherited genetic mutations like BRCA1 or BRCA2. The majority are considered sporadic, meaning they occur due to a combination of age, lifestyle, and other non-genetic factors.

What happens if breast cancer is left untreated?

If left untreated, breast cancer can grow and spread to nearby tissues, lymph nodes, and distant organs like the bones, liver, lungs, or brain. As it progresses, symptoms may worsen and the chance of survival drops significantly. Early detection and timely treatment greatly increase the chances of a successful outcome.

Conclusion

Breast cancer is a complex but treatable condition, especially when found early. Advances in diagnosis, surgery, medications, and supportive care have made a significant difference in how women live through and beyond the disease. Understanding the different types of breast cancer, available treatments, and practical ways to manage side effects helps women feel more confident and prepared. With the right care, support, and information, most women can face breast cancer with hope and strength.

References

1. Waks AG, Winer EP. Breast cancer treatment: a review. JAMA. 2019;321(3):288–300. doi: https://doi.org/10.1001/jama.2018.19323


2. Gradishar WJ, Moran MS, Abraham J, Aft R, Agnese D, Allison KH, et al. NCCN guidelines insights: breast cancer, version 4.2021. J Natl Compr Canc Netw. 2021;19(5):484–493. doi: https://doi.org/10.6004/jnccn.2021.0027


3. Harbeck N, Penault-Llorca F, Cortes J, Gnant M, Houssami N, Poortmans P, et al. Breast cancer. Nat Rev Dis Primers. 2019;5(1):66. doi: https://doi.org/10.1038/s41572-019-0111-2


4. Narod SA. Can advanced-stage breast cancer be cured? Nat Rev Clin Oncol. 2021;18(1):25–32. doi: https://doi.org/10.1038/s41571-020-00422-2


5. Sun YS, Zhao Z, Yang ZN, Xu F, Lu HJ, Zhu ZY, et al. Risk factors and preventions of breast cancer. Int J Biol Sci. 2017;13(11):1387–1397. doi: https://doi.org/10.7150/ijbs.21635

Notice to the User

This article is part of the 'Public Education Series' initiative by Exon Publications. It was written by professional medical writers for the general public in plain language, based on peer-reviewed articles indexed in PubMed, and further reviewed for scientific accuracy by experts. The views and opinions expressed in this article are believed to be accurate at the time of publication. However, the publisher, editors, and authors cannot be held responsible or liable for any errors, omissions, or consequences arising from the use of the information provided. The publisher makes no warranties, explicit or implicit, regarding the contents of this article or its use. The information in this article is intended solely for informational purposes and should not be considered medical advice.