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well sometimes it just depends what kind of cancer it is. But for breast cancer no it doesn't show up in blood. the only way the can tell if you have Breast cancer is by doing a breast exam. if the doctor sees a lump under your boob(s) or on the side by your armpit then you do have breast cancer. you can also do self exams. all you have to do it be topless and stand in front of a mirror, you lift up one boob then check to see if there is a lump you also wanna feel under your boob then you do the same thing to the other boob.

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12y ago

What else can I help you with?