Do I need a mammogram?
 

There are differences of opinion in the medical community about the
value of mammography among women under the age of 50, as shown in
Table 1. Some people feel that even if only a few deaths are
preventable, the time spent, anxiety, additional testing and well
worth the discomfort.
Others feel that it does not apply to so few deaths preventable by
early detection and the risk of having a mammogram than profits. Still
others felt that the benefits and risks are shared enough so that
women must weigh the benefits and potential risks and make a personal
decision.

http://www.gelais.com/women-health/mammogram.html