Span did not see a doctor, but he was able to get treatment after leaving Thursday's game in the sixth inning.
Span started to feel pain in the area -- the rectus abdominis muscle -- where he had surgery in early March. He ended up going 0-for-2 with a run scored and a walk during the Nationals' 8-2 victory over New York.
Span is still not sure if he had a setback. Since coming off the disabled list on April 19, Span has been a hot hitter, going 13-for-43 (.302) with two home runs and seven RBIs.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the Time. He also can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.