A meta analysis in research is associated with a very high level of evidence regarding a research matter.
A meta analysis of case control studies published in and after 1980 found that oral contraceptive (OC) use is associated with an increased risk of premenopausal breast cancer, especially those who used it for a long period of time before first pregnancy. There is a 40% to 70% increased in risk for those who used it for more than 4 years. This is quite scary.
Many of us may not be aware that OC is classified as group 1 carcinogens (i.e. can cause cancer) by the World Health Organisation. These drugs are often prescribed for conditions ranging from acne to any menstrual problem.
In my experiences, these conditions can be corrected safely with lifestyle changes and phytomedicine without the use of OC.
It is very sad that many young women are asked by their doctors to take OC at a young age and thus increasing their risk of diseases such as cancer and infertility in future.
Kahlenborn, C., Modugno, F., Potter, D.M., Severs, W. (2006). Oral contraceptive use as a risk factor for premenopausal cancer: a meta analysis. Mayo Clinic Proceedings, 81(10), 1290-1302.