One day after shooting a five-under-par 65 in the third round, Woods walked off the Champions Course at PGA National in Palm Beach Gardens, Fla., with his children in tow. He was five over par for the day and trailing leader Rory McIlroy by 13 shots.
It's only the sixth time in 297 starts on the PGA Tour that Woods has withdrawn, although it's happened four times in the last five years.
"It's my lower back with spasms," Woods said in a statement released by the tour. "It started this morning warming up. It’s the same feeling I had at Barclays."
With the Masters -- the first major of the year -- set for April 10-13, Woods said he will weigh his options about trying to play next week in the Cadillac Championship at Doral, where he's the defending champion.
"I'll get treatment every day to try to calm it down," Woods said. "Don't know yet. We'll see how I am, wait until Thursday and see how it feels."