Use of the pill has been shown to cause [[breast cancer]], increasing the risk by almost 50% according to an analysis of 34 different studies.<ref>http://breastcancer.about.com/b/2006/11/10/birth-control-pill-increases-breast-cancer-risk.htm</ref> | Use of the pill has been shown to cause [[breast cancer]], increasing the risk by almost 50% according to an analysis of 34 different studies.<ref>http://breastcancer.about.com/b/2006/11/10/birth-control-pill-increases-breast-cancer-risk.htm</ref> |