Risk Factors for Breast Cancer

Age and Gender as Risk Factors for Breast Cancer

Breast cancer predominantly affects women, though men can also develop the condition. The risk increases significantly with age, with most cases diagnosed in women over 50 years old. Hormonal changes during menopause may also play a role in increasing susceptibility. While younger individuals can develop breast cancer, the probability is considerably lower in this age group. Additionally, women are about 100 times more likely than men to develop breast cancer due to hormonal differences (Shockney, 2025).

Family history of breast cancer is another crucial factor. Women with a first-degree relative (mother, sister, or daughter) diagnosed with breast cancer are at a higher risk. Genetic mutations such as BRCA1 and BRCA2 further elevate this risk. Testing for these mutations can help assess an individual's likelihood of developing the disease stated by the cancer research UK.

Which Lifestyle Factors Increase Breast Cancer Risk?

Although some risk factors, such as genetics, are beyond your control, there are several lifestyle factors that may increase breast cancer risk, including obesity, physical inactivity, alcohol consumption and smoking. Adopting healthy habits such as maintaining a healthy weight and staying physically active may lower your chances of developing breast cancer.

Below are lifestyle risk factors that may increase breast cancer risk.

Alcohol Consumption 

Regular alcohol intake has been linked to an increased risk of breast cancer. Even moderate drinking raises oestrogen levels, promoting tumour growth and increasing cancer risk. Limiting alcohol can notably reduce this risk.

Obesity

Being overweight or obese, particularly after menopause, raises breast cancer risk due to elevated levels of oestrogen produced by excess fat tissue. Maintaining a healthy weight through balanced nutrition and regular physical activity is crucial for reducing this risk.

Physical Activity

A sedentary lifestyle significantly contributes to breast cancer risk. Regular physical activity not only helps control weight but also balances hormone levels, reducing overall breast cancer risk. Aim for at least 150 minutes of moderate-intensity exercise weekly.

Diet

Although no specific foods can prevent breast cancer outright, a balanced diet rich in fruits, vegetables, whole grains, and lean proteins can support overall health and lower cancer risk. Minimising processed foods, sugary snacks, and excessive red meat can further enhance these protective effects.

Smoking

Smoking is increasingly recognised as a significant risk factor for breast cancer, especially among premenopausal women. The harmful substances in tobacco can damage DNA and promote tumour development, making smoking cessation a critical preventive measure.

How Do Hormones and Reproductive Factors Affect Breast Cancer Risk?

Lifetime exposure to oestrogen may influence breast cancer risk. Factors such as early menstruation, late menopause, not having children, having children later in life and certain hormone therapies may affect risk levels.

• Age at First Period and Menopause: Women who begin menstruating before age 12 or experience menopause after age 55 have prolonged exposure to oestrogen and progesterone, increasing the risk (BrestCancer. org, 2023).
• Pregnancy and Breastfeeding: Women who have their first child after age 30, or those who never have children, face a slightly higher risk. Breastfeeding, on the other hand, may offer some protection.
• Hormone Replacement Therapy (HRT): Combined oestrogen and progesterone therapy used during menopause can increase the risk of breast cancer. However, the risk declines once HRT is stopped (DePolo, 2024).
• Oral Contraceptives: Some studies indicate that current or recent use of oral contraceptives slightly raises breast cancer risk, but this risk diminishes after discontinuation.

Other Influential Factors

Emerging research highlights additional factors that may contribute to breast cancer risk. Chronic stress and poor mental health, while not directly proven to cause breast cancer, may lead to unhealthy behaviours such as overeating, smoking, or excessive alcohol consumption. These behaviours, in turn, increase risk.

Environmental exposures also play a role. Prolonged exposure to radiation, such as during cancer treatments or frequent diagnostic imaging, can elevate the risk. Additionally, exposure to certain chemicals, including those in some plastics and pesticides, is being studied for potential links to breast cancer development (Gearhart-Serna et al. 2023).

Lastly, maintaining regular health screenings and a balanced lifestyle can help reduce overall risk and improve early detection outcomes.

Frequently Asked Questions About Breast Cancer Risk

How Does Obesity Increase Breast Cancer Risk?

Obesity may increase breast cancer risk by affecting hormone levels, insulin regulation and chronic inflammation in the body.

Excess body fat can lead to higher levels of insulin and certain hormones, which may promote abnormal cell growth. Obesity is also associated with chronic low-grade inflammation, which may contribute to the development of several cancers, including breast cancer. Maintaining a healthy weight through regular physical activity and balanced nutrition may help reduce long-term cancer risk.

Does Breastfeeding Reduce Breast Cancer Risk?

Research suggests that breastfeeding may help lower breast cancer risk by reducing lifetime exposure to certain hormones and supporting normal breast cell development.

Can You Get Breast Cancer Without a Family History?

Yes. Most people diagnosed with breast cancer do not have a family history of the disease. While inherited gene mutations such as BRCA1 and BRCA2 increase risk, lifestyle, hormonal and environmental factors also play a role.

Book an Appointment at Gleneagles Hospitals

Understanding the risk factors for breast cancer empowers individuals to make informed decisions about their health. By recognising both controllable and uncontrollable risks, you can take proactive steps to protect yourself. Regular screenings and early detection are critical, as they greatly improve treatment outcomes. Adopting healthy lifestyle choices, such as maintaining a balanced diet, exercising regularly, and limiting alcohol intake, significantly reduces your overall risk. Staying informed about family medical history and communicating openly with healthcare providers ensures tailored advice and personalised preventive care. Ultimately, awareness, timely intervention, and consistent health management strategies form a powerful combination that enhances quality of life and long-term well-being.

At Gleneagles Hospitals, we are committed to providing comprehensive breast cancer screening and care. Our state-of-the-art facilities and experienced medical team ensure you receive the best possible support. Book your appointment today on our website and take the first step towards safeguarding your health. You may also book an appointment by downloading the MyHealth360 application from the Google Play Store or Apple App Store.