Her books include Pregnancy: The Best for You and Your Baby (2002) and How to Have a Baby and Still Live in the Real World (2003, US edition; 2004, UK edition ).
She also contributed to the Reader's Digest A to Z of Family Health and her work has been translated into Czech, Danish, Dutch, Finnish, Spanish and Swedish. 
At The Sun, Symons led a successful campaign for the breast cancer drug trastuzumab (sold as Herceptin) to be made available on Britain's National Health Service for women in early stages of the HER2 form of the disease.
By highlighting delays in the implementation of Britain's national bowel cancer screening, she also forced the British government to meet its own deadlines on the tests. 
Symons is the younger sister of Australian TV personality and musician Red Symons. 