Breast cancer risk is shaped by a mix of genetics, lifestyle and everyday habits. While certain behaviours can increase the likelihood of developing the disease, many warnings that circulate online are rooted more in fear than in evidence. From deodorants and plastic containers to hair dye, health myths often create unnecessary anxiety and distract from the factors that genuinely matter. Separating fact from fear can help you make informed choices without falling for misinformation.

According to Dr Lai, the belief that deodorant causes breast cancer is a common misconception. She explains that breast cancer begins in the breast and may later spread to the lymph nodes. She notes, “I won’t let her blame deodorant. It doesn’t cause breast cancer. Cancer starts in the breast and spreads to the lymph nodes, not the other way around.”

Dr Lai emphasises that alcohol is not harmless. While there is no safe level of consumption, she says binge drinking poses the greatest risk. Alcohol can increase oestrogen levels and damage DNA. She explains, “I won’t let her see alcohol as harmless. There’s no safe amount. It raises oestrogen and damages DNA, and binge drinking is the worst.”

The breast cancer surgeon highlights that grilled or smoked meat is not the issue. Instead, it is the burnt portions that should be avoided, as charring produces chemicals associated with an increased risk of cancer. She explains, “I won’t ban grilled or smoked meat, but I’ll limit the burnt parts. Burning creates HCAs and PAHs, chemicals linked to higher cancer risk.”

Despite mixed evidence, Dr Lai highlights that the WHO’s cancer agency does not classify hair dyes for personal use as a cause of cancer. The cancer surgeon notes, “I won’t make her stop using hair dye. The evidence is mixed, and the WHO’s cancer agency doesn’t class personal use as a cause. To be cautious, semi-permanent and temporary dyes show little to no risk.”

According to the breast cancer surgeon, while BPA can disrupt hormones and leach out of plastic when heated, there is no direct evidence linking plastic use to breast cancer. Rather than switching out of fear, she recommends choosing alternatives as part of healthy everyday habits. Dr Lai explains, “I won’t let her panic about plastics. BPA can disrupt hormones and leak out when heated, but human breast cancer evidence isn’t settled. Switch to glass or steel because it’s easy, not out of fear.”

Dr Lai emphasises that staying healthy and adopting healthy habits does not make you entirely risk-free. Lowering your risk is not the same as eliminating it. Many people do everything right and still develop breast cancer. She states, “I won’t let her think healthy means perfect. Lowering risk isn’t removing risk. Some women do everything right and still get breast cancer. Others have every risk factor and never do. The goal is informed action, not control.”

Genetics play a major role in breast cancer, but not having a family history of the disease does not make you risk-free. Dr Lai highlights, “I won’t let her think ‘no family history’ means ‘no risk’. Most women diagnosed have none. Family history matters, but its absence isn’t a free pass.”

Dr Lai explains that long-term sleep deprivation disrupts the body's internal clock, which the WHO’s cancer agency considers a significant cancer risk factor. She recommends making quality sleep a priority. She notes, “I won’t let her treat sleep as optional. Long-term body clock disruption is something the WHO’s cancer agency takes seriously, and habits built now carry forward. Protect the body clock early.”