This is not the first time that Jansen has dealt with this in his career, as he missed a month for the same issue in 2011. His absence lasted a month at that time due to blood-thinning medication, although, there is not yet word if he will need medication this time around.
The closer reportedly did not feel well on Thursday at the team hotel and was taken to a Denver hospital, before being sent back to Los Angeles for further evaluation. He had the same issue while pitching in Colorado in 2012 and ended up undergoing a procedure for the condition on October 23rd of that year.
The 30-year-old is tied for the National League lead with 32 saves and is expected to be replaced by Scott Alexander until he is cleared to come back.
Staying out west, another star that went down with an injury was Mike Trout of the Los Angeles Angels, who was placed on the 10-day disabled list with inflammation in his right wrist. Manager Mike Scioscia is confident that his time off will not be extended longer than the 10 days.
The move is retroactive to last Monday, as Trout has missed seven straight games already with this issue. It was treated as a day-to-day thing until Friday afternoon. The 27-year-old is batting .309 this season with 30 home runs and 60 RBIs. He also leads all of baseball with a .459 on-base percentage, yet his team has played their way out of playoff contention, as they currently sit just one game over .500 and in fourth place in the AL West.
The two-time All-Star did miss the first 39 games of last season due to a torn ligament in his left thumb after sliding in to second base. The team did not think he would need to go on the disabled list initially this time around, but he has not played since August 1st, so it was time to make a move.