Oh, how we've missed Jennifer Lawrence on talk shows.

The star of The Hunger Games: Catching Fire had to cancel her morning appearances but was bursting with anecdotes by the time she arrived at the Late Show With David Letterman tonight.

Dave asked J.Law about the recent medical issue that dampened her enjoyment of her hotly anticipated film's L.A. premiere and the 23-year-old Oscar winner replied with her usual candor.

"I thought I had an ulcer, but it turns out it was a 'fulcer,'" Lawrence said, coining a new word right off the bat. "I went to the emergency room."

Quizzed about her symptoms, she spared no details: "I just had this really bad pain for, like, three weeks. And you know you can only s--t your pants so many times a day before you go to the emergency room, before you're like 'I need to go to the hospital.'"