'raises uncertainties' is correct and usable in written English.
You can use it to express when something introduces doubt or uncertainty into a situation. For example, "The sudden change in policy raises uncertainties about how it will be implemented."
On the negative side, war raises uncertainty and undermines the confidence of households and businesses.
Courtroom litigation raises uncertainty — about the ultimate cost for BP, and for the victims who choose to fight in courts.
"High inflation rates usually go hand-in-hand with a higher variability of inflation, which raises uncertainty and can thus reduce investment spending".
In a country long accustomed to state secrecy, China's continued lack of transparency raises uncertainty on the scope of its economic transformation.
A weak economy or a traumatic event like a financial crisis or terrorist attacks will both raise uncertainty and provoke a policy response, but it's the economic event, not the policy, that raises uncertainty and hurts growth.I have my own back-of-the-envelope exercise.
The record number of anti-system politicians in office raises uncertainty about the strength of supposedly "consolidated" liberal democracies and highlights the need for further analysis of the signs of democratic deconsolidation.
It also raises uncertainty as to whether she'd be able to ― or willing to ― forcefully pursue equal rights protections for students, one of the major responsibilities of the department through its Office for Civil Rights.
However, our data demonstrating decreased CD69 expression following TRAIL treatment of PBLs infected in vitro with HIV raises uncertainty regarding this hypothesis.
However, subsequent discovery of non-neutral patterns of sequence variation on the fused 4th chromosome raises uncertainty about the assumptions underlying this contrast, because nucleotide diversity on the fused 4th chromosome has been influenced by a segregating chromosomal inversion [24].
Closer scrutiny of the mortality data raises uncertainty.
