'Survivor: Philippines' Preview: Ailing Castaway Faces Game-Changing Decision (Video)

Jeff Probst and medical personnel are forced to visit one tribe's camp in Wednesday night's episode when one contestant becomes seriously ill.
Monty Brinton/CBS

Warning: Spoiler alert!

At the end of last week's Survivor: Philippines, a teaser revealed that one castaway might be forced to evacuate the game in the upcoming episode due to medical reasons.

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A new preview clip from CBS reveals who that castaway is.

Dana Lambert from the Kalabaw tribe is the person whom host Jeff Probst visits at camp after she starts running a fever and having severe pain in her abdomen.

When Probst asks about her level of pain, Lambert replies, "like a knife."

Medical personnel are called in, and they say the decision to stay in the game is ultimately up to her.

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Incidentally, this season featured three returning survivors -- Mike Skupin, Jonathan Penner and Russell Swan -- who were all medically evacuated from previous seasons. Swan was voted out in last week's episode.

Survivor: Philippines airs at 8 p.m. Wednesdays. Watch the preview below.