Ms McCall, who hosts ITV's Long Lost Family and is a panellist on The Masked Singer, told how the lump 'came and went' before she finally got it checked.
Her outlook is good: treatment for the disease, which affects 55,000 women a year in the UK, is now excellent and catching it early gives her the best possible chance of beating it fast.
Davina McCall, 58, took to her Instagram with the news on Saturday and explained how the disease had been caught 'very very early' but would still require radiotherapy.