We know the incidence of breast cancer in women in their twenties and thirties is rising, but right now we don't have the technology or tools to detect cancer in women that young. The radiation from mammograms may be negligible around 40, but it can have an impact in the twenties and thirties. Also, the density of the breast is going to be high in the twenties and thirties, and mammograms probably wouldn't be that effective at all. Hopefully, we'll have a blood test soon or other methods of detection, but right now we don't have the means to detect. We have to rely on self-exams and body awareness.
