The two-time All-Star, the Athletics' projected opening-day starter, began experiencing tightness in the elbow two weeks into spring training. The right-hander has yet to appear in a game but has maintained a throwing program.
"It's a precautionary thing," A's manager Bob Geren said. "It's been a little tender."
Geren said Duchscherer may have an MRI.
Duchscherer was 10-8 with a 2.54 ERA in 22 starts last season, his first as a starter.