Rapper Trina -- Hospitalized After Passing Out in Airport

"Here We Go" rapper Trina was hospitalized early Monday morning -- after passing out in a Florida airport over "dehydration and overexertion."

We're told Trina had been traveling all day while battling some sort of illness -- and hit the deck minutes after stepping off the plane.

The 34-year-old rapper was rushed to a nearby hospital ... where she's recovering.