He suffered a terrifying fall down the stairs on Friday, which forced him to pull out of the first X Factor live shows.
And Simon Cowell has now revealed his poor health was the reason behind the tumble - which had come as a 'huge shock'.
Speaking to The Sun, the 58-year-old explained he had fainted due to 'low blood pressure', and vowed to start 'taking good care of himself' from now on, for the sake of his son Eric, three.
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