May left Saturday’s start against the Milwaukee Brewers after just 27 pitches due to the ailment and is expected to undergo an MRI on Monday.
Dodgers manager Dave Roberts said May felt “kind of a shooting sensation” through his arm on a curveball he threw in Saturday’s extra-innings loss.
In five starts this season, the 23-year-old righty is 1-1 with a 2.74 ERA and 35 strikeouts.
May beat out David Price for the fifth spot in Los Angeles’ rotation coming out of spring training.
Information from The Associated Press was used in this report.