"I'm okay", she told reporters.
She initially put her feet down to slow her progress but quickly began to rock back and forth at more than 60 miles per hour.
But Sweeney flashed a quick smile to reassure her fans as she walked along the track to the Olympic Village clinic for further examination. She'd initially missed out on the 2010 Winter Olympics team after losing to her sister Megan, and then also missed out on the 2014 Games in Sochi, Russia.
Sweeney, 24, was on her fourth run when she tumbled down the track at turn No. 9 and crashed.
Sweeney hit the turn at over 60 miles per hour, trying to use her feet to slow down her descent, but to no avail.More news: The Obama Portraits and the History of African American Portraiture
The crash came on the treacherous stretch of the course from Turn 12 to Turn 9, where multiple athletes have faltered on this course. "It's pretty crushing", she said after the crash.
Emily Sweeney starts to lose control of her toboggan before crashing.
"Oh no, that's awful, you really hate to see that, where the athlete's feet go higher than her head". Teammate Dajana Eitberger earned silver, .367 seconds behind Geisenberger's four-run combined time of 3 minutes, 5.232 seconds. She is also a sergeant in the USA military.
Alex Gough won Canada's first medal in luge, taking bronze.
Only 20 women from the original field of 30 advanced to the final two runs. After the crash, officials stopped competition until she was properly evaluated.