The 33-year-old writes herself on Instagram:
"There has been a lot to take in, but I have already begun treatment and I am incredibly grateful to be surrounded by love and support from my family and my close friends”, she writes and continues:
”I am ready to meet this fight in the same way as I have met challenges on the track.”
Ciara Mageean has – in addition to the European Championship gold – also won a European Championship silver and two European Championship bronzes on the same distance. She has also represented Ireland in the Olympic Games twice and holds the Irish records on four distances.