Her first appearance to the film industry was on 1999 in the tamil film named Jodi, as a supporting role character.The first project she accepted was the Priyadarshan-directed Lesa Lesa,and also creating an offer to star in the A. R. Rahman musical, Enakku 20 Unakku 18. However both the projects' releases were severely delayed, and her first release was Ameer's Mounam Pesiyadhe opposite Surya Sivakumar. The film became a moderate success at the box office and did manage to gain credentials for Trisha, with critics claiming that she was undoubtedly a refreshing new find, with sparkling eyes and appealing demeanour.
Manasellam her second project, saw her play a cancer patient, but the film also went unnoticed despite positive reviews for the film and the actress.However her next in 2003, the Hari-directed police film Saamy with Vikram, became a blockbuster at the box office,landing her new offers.
