The duchess wrote that she and her husband, the Duke of Cambridge, "would not hesitate" to seek help if their two children needed it.
Her comments marked the launch of theYoung Minds Matter editorial series.
Michelle Obama said she was pleased Catherine was shining a "bright light on mental health".
The duchess is guest editing the Huffington Post on Wednesday from a temporary newsroom in Kensington Palace.
Her role will see her commission blogs, articles and videos from a selection of leading figures on the psychological well-being of children, including a blog from the US first lady about a man who suffered mental health problems after leaving the navy.
The duchess began campaigning on mental health soon after getting married to the Duke of Cambridge in 2011 and is a patron of several related charities.
Writing on the Huffington Post website, she said she had heard "some heart-breaking stories about lives that had been torn apart, with devastating impacts for all involved, particularly children".
'Parents afraid'
"What I did not expect was to see that time and time again, the issues that led people to addiction and destructive decision-making seemed to almost always stem from unresolved childhood challenges," she wrote.
"It became clear to me that many children - even those younger than five - have to deal with complex problems without the emotional resilience, language or confidence to ask for help.
"And it was also clear that, with mental health problems still being such a taboo, many adults are often too afraid to ask for help for the children in their care."
0 Comments
Share and comment. Enjoy!