A man was struck by a train in Brooklyn this morning, authorities said.

The 50-year-old was hit by a Queens-bound Q train about 10:30 a.m. at the Avenue J station near 15th Street, according to an MTA spokeswoman and FDNY.

He is being treated for head trauma at Kings County Hospital, the FDNY spokesman said.

It was not immediately clear how he was struck, authorities added.