Smith will undergo an MRI after feeling tightness in his right forearm while playing catch Wednesday, Abbey Mastracco of the New York Daily News reports.
Smith missed a chunk of time earlier this season with a shoulder problem and now has another arm issue to contend with. The righty has been a high-leverage reliever for the Mets this season when healthy, posting a 3.06 ERA and 23:9 K:BB over 17.2 frames.