What is wrong with Mets pitcher Matt Harvey?

Mets star hurler Matt Harvey could miss his Opening Day start due to an undisclosed injury.

The Mets were extremely vague Monday when discussing what, exactly, Harvey’s issue is but New York general manager Sandy Alderson did say that it did not have anything to do with a traditional baseball injury.

“It’s a non-baseball related issue that he’s got to address,” Aldersontold SNY. “It came up this morning, and as a result he won’t pitch [Tuesday] and we’ll just see what happens with the follow-up test and consultation.

“I was informed by our medical staff that there was an issue. But my understanding is that yes, he had a symptom and it was investigated. So we’re still in that process.

“I think we need to wait for more medical information before we decide if it’s of great concern or no concern.”