Should i have a mammogram done now or wait until i am 40?

Likely wait...: Cancer screening is about the risk/benefit ratio. If you do not have a family history of early breast or ovarian cancer (brca1 or 2 mutations), getting a mammogram "too early" could cause more harm than good. Mammograms have a significant false positive rate which means you might undergo a unneeded procedure (biopsy) that could cause you harm (both physically and emotionally).

Probably wait unless: According to the American Cancer Society, American College of Radiology, and others, annual screening mammography should begin at age 40. Screening may begin sooner if you are a BRCA carrier or are otherwise at high risk. If you have a lump or other symptom, see your doctor. Ultrasound would probably be the first imaging test of choice.