A Peloton instructor was diagnosed with breast cancer at age 35. Here's how common the disease is at every age.

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Mammogram breast cancer screening
A mammogram.

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Peloton instructor Leanne Hainsby, 35, said she was diagnosed with breast cancer after a doctor told her not to worry about a lump in her breast

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a woman performing a breast cancer self exam
Breast cancer is most common in women older than 50, but screenings in younger women can help with early detection.

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