The Northern Irishman said increasing levels of pressure may have contributed to England cricketer Jonathan Trott’s battle with a stress-related condition.
“As sport becomes so big and there’s so much pressure and so much on the line, it’s becoming more and more common that these sorts of stress-related illnesses are happening,” he said.
“It just shows how much of a mental toll it takes on you sometimes.”
Though not troubled by mental ill-health, McIlroy has endured a testing season of lows and faltering revivals, but hopes to claim a first victory of 2013 at the Australian Open this week.
“It’s been a long year, I guess mentally more than physically,” he added. “Mentally it’s quite draining – not just the golf and being frustrated with my game.”