Trisha was born to Krishnan and Uma in Chennai into a Tamil Brahmin (Palakkad Iyer) family in Chennai, Tamil Nadu. She completed schooling at the Sacred Heart Matriculation School in Church Park, Chennai, and later pursued a Bachelor of Business Administration (BBA) course at the Ethiraj College for Women (Chennai). She ventured into modeling and appeared in several print and television commercials. In 1999, she won the “Miss Salem” beauty pageant, and later the same year, the Miss Madras contest. She had also won Miss India 2001 pageant’s “Beautiful Smile” award.