Jansen dealt with similar symptoms in 2011 and 2012. He sat out a month in 2011 and three weeks in 2012. He had an episode related to the Coors Field altitude in 2015, but returned to the mound a few days later.
“He’s in a really good frame of mind,” Friedman said. “We’ll hold down the fort for him and be ready to receive him with open arms when he’s ready.”