Constant exposure to details of “unspeakable crimes and traumatic events” has triggered a three-month leave of absence by police and corrections minister and Williamstown MP Minister Wade.
Mr Noonan will be stepping down from his ministerial duties as well as his role as the Member for Williamstown.
He revealed on Monday that the accumulation of the exposure through his role as police minister has taken an unexpected toll.
“I need time to receive further support and assistance including professional counselling,” he said in a statement.
“This has been a difficult decision but I believe it is the right one.”
Mr Noonan extended thanks to his wife and family for their “love and encouragement”.
He added that he was grateful to Premier Daniel Andrews for his “steadfast support and advice”.
“I look forward to resuming my duties in the Cabinet and as the Member for Williamstown in due course.”
Finance Minister Robin Scott will take over Mr Noonan’s ministerial duties while he is on leave.