What causes this?

Florida Marlins slugger Miguel Cabrera left Thursday's game against the New York Mets after two innings with a stiff torso.

Rigor Mortis? The Marlins can ill afford to lose their best offensive player for any length of time.

The Mets poured it on after Cabrera left the game, scoring six runs in the third. Beltran picked up two doubles and a homer to help New York to an 11-3 win over the Marlins. The Mets outscored them 20-5 in the two game series.