Swisher said that his elbow has been sore for some time, but he felt something different after firing a fourth-inning Vladimir Guerrero double back to the infield during a 5-4 loss to the Orioles in Baltimore.
"It's just scary -- I've never had something like that," said Swisher, who was seen by an Angels team physician on Friday.
The Yankees said that Swisher's MRI results would be announced on Saturday. Before New York's 2-1 loss to the Angels, manager Joe Girardi said that he was hoping to get Swisher back in the lineup for Saturday's game.
"It might be a day or two, would be my guess," Girardi said. "He's had [soreness], and it goes away. We'll go from there. ... The good thing is that it goes away, but you never know when it's going to reoccur."
Swisher said that the soreness bothered him more while throwing than hitting, but he acknowledged some panic after feeling pain.
"I grabbed the ball and it was a little wet, and I kind of grabbed it to get it in as fast as possible," Swisher said. "I threw it and was like, 'Wow, that didn't feel right.'"
Swisher spent most of Friday afternoon receiving treatment in the visitors' clubhouse.
"Right now, man, it's such a crucial time in the season," Swisher said. "The last thing I want to do is go down right now. If we need to take a day or maybe need to take another day, it just depends on what the doc says."