She told 60 Minutes that she started seeing Nassar when she was 15.
Her "Fierce Five" teammate McKayla Maroney last month said Nassar had abused her. He eventually was arrested on child pornography charges and pleaded guilty. Raisman is the second US gymnast in the past month to accuse Nassar of abuse, with McKayla Maroney making similar claims in mid-October.
"Why are we looking at why didn't the girls speak up?" she asked. Nassar, who was USA Gymnastics' team doctor for almost two decades, was sacked in 2015 and is facing nearly two dozen sexual assault charges against him; he's also set to be sentenced next month on three federal child pornography charges. "I'm really upset because it's been - I care a lot, you know, when I see these young girls that come up to me, and they ask for pictures or autographs, whatever it is, I just. I just want to create change so that they never, ever have to go through this". There will be even more details about her experience when her book, Fierce, comes out on November 14, 2017.
She also won individual gold and silver in the floor exercise, silver in the all-around and bronze in the balance beam, making her one of the most-decorated American gymnasts of all time.
Raisman said she spoke to FBI investigators after serving as national team captain at the 2016 Games in Rio de Janeiro.
Three former members of the national team then accused Dr. Nassar of sexual abuse. She claimed the abuse began when she was just 13, and she had been reluctant to speak out because she knew he was a renowned physician. More and more women have recently spoken out against him, including another Olympic gymnastics star, McKayla Maroney.
"I thought I was going to die that night", Maroney said.
Raisman continued after Jon Lapook of "60 Minutes" noted her anger. "USA Gymnastics is very sorry that any athlete has been harmed", the statement says, according to CBS, "We want to work with Aly and all interested athletes to keep athletes safe".
Dantzscher also filed a lawsuit against Nassar in California last September as "Jane Doe".
In a statement to 60 Minutes, USA Gymnastics said it has made major changes since the Nassar scandal broke.
It was commissioned by USA Gymnastics and conducted by Deborah Daniels, a former Federal prosecutor, who spent a significant portion of her career prosecuting child sexual offenders, and scrutinised the organisation's methods.