I was diagnosed with breast cancer last Tuesday and my head is all over the place. I feel as if I am describing or talking about someone else and I am behaving in an incredibly calm way which is unnerving. I am presently waiting on surgery ,which will be mid October, and thankfully very fast from diagnosis.
I am a support for my sister ,who has lung and brain cancer , and attend her meeetings with her health team. She has a meeting with her oncologist to get results from a CT scan on the 5th October.
Should I wait until after her meeting to tell her about my own cancer ? When is the best time ? She is on holiday and not due back until Thursday.
Hi Mirocat
I am sorry you have received a breast cancer diagnosis and that your sister also has cancer. I hope her scan shows her cancer to be stable. I don’t think there is such a thing as a best time to tell her, other than waiting until she is home and you are face to face. I think I would be inclined to tell her sooner rather than later. My logic is that if her scan brings bad news the “oh and by the way I also have cancer” will be more difficult for both of you.

Macmillan Support Line - 0808 808 00 00, 7 days a week between 8am-8pm
I am a Macmillan volunteer.
I have metastatic Triple Negative Breast Cancer, in remission
Whatever cancer throws your way, we’re right there with you.
We’re here to provide physical, financial and emotional support.
© Macmillan Cancer Support 2026 © Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). Also operating in Northern Ireland. A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 3rd Floor, Bronze Building, The Forge, 105 Sumner Street, London, SE1 9HZ. VAT no: 668265007