She was noticed after winning several beauty pageants like the Miss Madras contest (1999), which marked her entry into filmdom. Trisha rose to fame with her roles in Tamil movies, Saamy and Ghilli. Born to Krishnan and Uma Krishnan, in Palakkad, the Tamil Iyer actress got her higher education in Ethiraj College, Chennai.
Later, she modelled and won Miss Salem in 1999, Miss Chennai in 1999 and Miss India Miss Beautiful Smile in 2001. In school, she participated in several cultural activities, sports and school band. She studied in the same school as former Tamil Nadu Chief Minister J. Jayalalitha.
Trisha was the subject of a controversy in 2004 when a two and a half-minute video clip allegedly of her taking a shower in the nude circulated over the Internet. She, however, denied her appearance in the clip, saying, “It was not me in the 2½ minute bathing video clip and someone who wants to malign my name has done this on purpose.” In fact, the clip, which purports to have been shot from a hidden camera, makes it clear the subject, who often makes eye contact with the camera and engages in exaggerated pelvic gestures, knew she was being filmed. This makes it unlikely to be Trisha. In any case, she later filed a complaint with the Chennai Police Commissioner.
Subsequently, the Editor of the Tamil weekly Netrikkan was arrested by Chennai Police for publishing the nude screenshots of the video in the weekly.
In 2010, she was involved in a drug scandal controversy in Hyderabad, when a report on a Telugu channel claimed that Trisha‘s name was included with other top celebrities in the list of clients of Chima Clement, a Nigerian drug peddler, arrested in Hyderabad. Her name featured in the list because the channel assumed fashion designer Sidney Sladen, a close friend of Trisha of African origin, to be the Nigerian drug peddler. She declared the scandal as an attempt to malign her name in the Telugu film industry. She also sued the channel for dragging her name into the scandal.