Namitha made her entry into films through the Tamil movie Mounam Pesiyadhe (2002), starring opposite Suriya. However, it was her subsequent roles in Telugu and Tamil cinema that brought her widespread fame. Her breakthrough in the Telugu industry came with films like Gemini and Seema Simham .

In 2017, Namitha joined the inaugural season of Bigg Boss Tamil , hosted by Kamal Haasan. The reality show acted as a significant media turning point. It stripped away her scripted film persona, exposing mainstream audiences to her raw personality, personal viewpoints, and unfiltered communication style, which sparked intense daily debates across social media platforms. Digital Expansion and the OTT Era