In the four years since the global financial crisis, advanced economies have unloaded massive monetary firepower to try to jump-start growth and create jobs.
The US Federal Reserve and the Bank of England have employed large bond-purchase programs, or quantitative easing (QE), while the European Central Bank has focused on lending.
Last week, the Bank of Japan announced an aggressive QE program and monetary policy to tackle deflation and end decades of tepid growth.
So far the wave of easy money has not yet unhinged widespread expectations that prices will remain tame amid weak growth.
The IMF noted broad evidence that, since the mid-1990s, inflation has become "better anchored around long-term expectations, which themselves have become more stable."
But the IMF said the nature of inflation in advanced economies had changed since the 1970s.
In the past, inflation rose as unemployment fell, an inverse relationship known as the Phillips curve.
That relationship has flattened out, according to IMF analysts, and they now warn that inflation can suddenly pick up without an improvement in joblessness if other aspects of the situation change - particularly market and consumer expectations about inflation.
"The greatest risk for inflation, just as in the 1970s, is the possibility that expectations will become disanchored," the IMF said.
That underscores the need for central bankers currently pumping up their economies with easy money to not take their eyes off the threat of inflation.
"Central banks are already making use of whatever flexibility they have in responding to the unprecedented circumstances following the Great Recession," the international lender said.
"However, changes in the behaviour of inflation and profound challenges in the aftermath of the Great Recession may mean there is need for even greater flexibility."
-AAP