Two breast cancer susceptibility genes have been identified, BRCA1 and BRCA2, which when inherited in altered form, confer a substantially increased risk of breast and ovarian cancer. Genetic testing for mutations in the BRCA1 and BRCA2 genes is available to adult men and women at increased risk of carrying such a mutation based on their personal and/or family history of breast and/or ovarian cancer. Testing has profound implications not only for the individual being tested but for their entire family. It is therefore important that the psychosocial and ethical issues are explored through genetic counseling to ensure individuals make informed decisions about testing. Genetic testing may impact on psychological wellbeing, decisions regarding cancer risk management, childbearing and the wider family. Individuals who test positive for a mutation may face ethical dilemmas regarding childbearing and when and how to inform relatives of the genetic information. Female carriers will also face complex and challenging decisions concerning cancer risk management.