Emma Hannigan was an Irish author and blogger, best known for writing about her experience of suffering from cancer.

With a family history of breast and ovarian cancer, Hannigan's mother and maternal aunt tested positive for the responsible gene, BRCA1. She also received a 'positive' result in August 2005, which carries an 85% risk of developing breast cancer and a 50% risk of ovarian cancer. In 2006, Hannigan underwent a bi-lateral mastectomy (or both breasts removed) and a bi-lateral oopherectomy (or both ovaries removed) to reduce the risk of cancer developing to 5%. However, breast cancer soon developed, "in the neck, shoulder and under my arm", in 2007. After repeated treatment, a tumor always reappeared. She died at age 45 after her tenth battle with cancer.