Hormones and cancer
Our natural hormone levels change across our lifetime, especially for women, because of things like puberty, pregnancy and menopause.
Our lifestyles, including drinking alcohol or being overweight, can also affect hormone levels and cancer risk. And so can medicines like the Pill and HRT.
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The contraceptive Pill
The Pill affects the risk of different cancers in different ways, but overall it prevents more cases than it causes.
Hormones in our environment
The evidence linking chemicals that can act like our natural hormones to cancer has generally been weak.