How do i tell between breast cancer and cysts in the breast?

You can't: Cysts tend get bigger and smaller and change with your menstrual cycle. Multiple lumps are more likely to be cysts than cancer. But the only way to know for sure a lump is a cyst (and not a cancer) is to have it examined by a healthcare professional, who might order a mammogram and/or ultrasound.

You can't....: ...But i can. It is very easy to distinguish being a cyst, which is fluid-filled, and a cancer, which is almost-always solid, by performing an ultrasound. Alternatively, a needle aspiration can be done. This sounds worse then it is--it hurts about as much as having your blood drawn. Bottom line: if you find a lump in your breast, see your primary care doctor or gynecologist.