Manathil Uruthi Vendum (Eng: The heart needs to be strong) is a 1987 Indian Tamil language drama film directed by K. Balachander starring Suhasini, S. P. Balasubrahmanyam, Ramesh Aravind, Sridhar, Vivek, Lalitha Kumari, Chithra, Chandrakanth and Yamuna. Rajinikanth, Sathyaraj, and Vijayakanth make guest appearances. The film was dubbed in Telugu as Sister Nandini.
This is the story of Nandini, a nurse, played by Suhasini. She is the sole bread winner of her huge family including six siblings and unemployed parents, and she faces many hurdles in her life including a divorce, loss of a brother, an eloped sister, a failed second romance and an organ donation. She handles them with dignity and wins the hearts of one and all including her suspicious ex-husband when she donates him her kidney. S. P. Balasubrahmanyam plays the role of a dedicated Doctor, who inspires Nandini to take the ultimate decision in life to continue serving her patients.
Directed by K. Balachander
Produced by Rajam Balachander & Pushpa Kandaswamy
Written by K. Balachander
Starring Suhasini, Sridhar, S. P. Balasubrahmanyam, Ramesh Aravind, Vivek
Music by Ilaiyaraaja
Cinematography R. Raghunatha Reddy
Edited by Ganesh – Kumar
Production Kavithalayaa Productions
Distributed by Kavithalayaa Productions
Release date 19 October 1987
Running time 147 minutes