Udit began singing since the early 1970s on Radio Nepal, delivering folk songs in Maithili and Nepali. In 1978, he moved to Mumbai for a music scholarship. In Mumbai, he studied traditional Indian music for six years at Bharatiya Vidya Bhavan.
In 1980, music director Rajesh Roshan asked him to sing in the film Unees Bees with Mohammed Rafi. His name began to stick out after bringing "Papa Kehte Hain" in Qayamat Se Qayamat Tak (1988) film which produced the first Filmfare Award for him. Qayamat Se Qayamat Tak film also raises the name of playback singer Alka Yagnik, and the main cast in the film, Aamir Khan and Juhi Chawla. After Qayamat Se Qayamat Tak, Udit Narayan and Alka Yagnik became duet couples in films such as "Dil" and "Jo Jeeta Wohi Sikandar". In addition to singing, Udit also tried playing films, such as in the Nepali film titled Kusume Rumal and Pirati.
In 1995, Udit had a great success after delivering the song "Mehndi Laga Ke Rakhna" from the film "Dilwale Dulhania Le Jayenge". After five consecutive years being nominated without ever winning, Udit finally won the Filmfare Award for Best Playback Male Singer in 1995. The following year, Udit won the third Filmfare Award for the song "Pardesi" in Raja Hindustani film song.