Some of the risk (chance) of getting ovarian cancer is linked to the foods a woman eats. That is a modifiable (changeable) risk factor, meaning a woman can change her chance of getting ovarian cancer depending on what foods she eats. About 10% of the risk of getting ovarian cancer is because of family history. Researchers think that some chemicals may increase the risk of getting ovarian cancer. This is difficult to prove, but chemicals such as pesticides, herbicides, plastics (especially those that the body can confuse with hormones), air pollution, water pollution (especially in drinking water) and radiation (naturally-occurring or medical) are known to cause some cancers. For ovarian cancer, it appears that the largest risk is simply chance. Once in a while, a tiny mistake occurs in the body. The more egg-release cycles that a woman has, the more chances there are that a tiny mistake could happen and cause cancer to start. Unlike certain other types of cancer, for ovarian cancer there isn't one main, obvious, external risk factor such as smoking, sun exposure, alcohol or a virus or bacterium.
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