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Ronaldo stopped playing football in 2011 after suffering with hypothyroidism.Hypothyroidism is an auto-immune disease which causes the body’s antibodies to attack it’s own tissue.This causes the thyroid gland – which helps to regulate the body’s weight by regulating the body’s metabolism – to stop working correctly.Ronaldo was named FIFA’s world player of the year three times prior to his retirement from football in 2011.
