Despite the significant development in psychiatry, stigma remains one of the biggest barriers preventing mentally-ill people from seeking help. Cyberbullying, a form of harassment using electronic means, affects people worldwide. This project investigates the manifestation of stigma through cyberbullying on Twitter. We found that mental-illness related words are frequently used to insult others. Such Environment with toxic messages belittles the pain mentally-ill people experience and perpetuates the stigma associated with mental diseases.