Laura, who shares son Rocco, five, and daughter Tahlia, four, with her husband Alex Goward, said the problem started when her youngest child was about seven-months-old.
She made a trip to the doctor after a large amount of bruises appeared on her legs and caused concern.
Blood tests confirmed her platelets were low, and she was diagnosed with the disorder.
ITP is quite rare in adults, around 4,000 people in the UK have the condition at one time.
The presenter recently returned home from Greece where she was filming scenes for the new series of A Place in the Sun, which will air in a few months time.