Myths about breast cancer

Sometimes it’s hard to know what you should believe and what to ignore about breast cancer.

Here are some common myths about breast cancer causes and risk factors. These are either:

• not true because research does not support the claim
• not proven because not enough research has been done to support the claim.

We also recommend some reliable sources of breast cancer information. 

Wearing underwire or tight-fitting bras

According to Cancer Australia, research does not support the claim that underwire or tight-fitting bras increase a person’s risk of breast cancer. Cancer Australia is Australia’s leading national cancer control agency.

Using antiperspirants or deodorants

There is not enough evidence to show that using antiperspirants or deodorants can increase your risk of developing breast cancer. According to internet rumours, the skin absorbs the chemicals in underarm antiperspirants. These chemicals then interfere with lymph circulation, cause toxins to build up in the breast, and eventually lead to breast cancer.

Abortion and spontaneous miscarriage

Cancer Australia states clearly that there is no link between termination of pregnancy and an increased risk of breast cancer. This includes both induced abortion and spontaneous miscarriage.

Breast implants

Several studies have found that silicone breast implants do not increase a person’s risk of developing breast cancer. Silicone breast implants can cause scar tissue to form in the breast, which is not the same. Macro-textured breast implants used in breast reconstruction may be linked to a very rare type of lymphoma called anaplastic large cell lymphoma. These implants are not available in Australia. 

Stress

Most research does not show a link between stress and increased risk of breast cancer. However, there have been some conflicting results. More research is needed in this area. 

Bump or knock to the breast 

Research has shown a bump or knock to the breast does not cause breast cancer. However, it can draw attention to an existing lump in the breast.

If you are still concerned

If you have read or heard something you are unsure about:

• check the risk factors and unproven factors on Cancer Australia’s Breast cancer risk factors website
• contact our Helpline
• visit or join our Online Network, where other people may have asked the same questions as you
• submit a myth, rumour or question to Cancer Council's iHeard website and see previous questions and answers.

Talk to your doctor or healthcare professional if you are still worried.