Nezha Bidouanes first international success was the victory in the Africa Championship in 1990. In 1991 she first took part in the World Athletics Championships, where she reached the semifinals (56.62 s). She also made it to the semi-finals at the 1992 Olympic Games (55.08 s).
After a long sporting career with further medal places at world championships and the Olympic Games, she ran her last race on October 6, 2004 in Algiers , which she won. With her best time of 52.90 seconds, set on August 25, 1999 at the 1999 World Championships , she was 9th on the all-time best in the world at the end of the 2007 season (see 400-meter hurdles ).