Alizadeh at 18 years of age won a bronze medal in the taekwondo 57 kg weight class at the 2016 Summer Olympics in Rio de Janeiro by defeating Swedish athlete Nikita Glasnović. Her victory made her the first Iranian woman to win a medal at a Summer Olympics.
She also won a gold medal in the women’s 63-kg class at the Nanjing 2014 Youth Olympics. She beat London 2012 and Rio de Janeiro 2016 gold medallist Jade Jones at the 2015 World Championship to win a bronze medal. She also won a silver medal two years later at the 2017 World Taekwondo Championships.She was listed in 100 inspiring and influential women from around the world for 2019 by BBC.
During the 2020 Summer Olympics, Alizadeh represented the Refugee Olympic Team, defeating Iranian athlete Nahid Kiani and pulling an upset against number one ranked Jade Jones before losing out on a bronze medal.