What is myositis that Samantha Ruth Prabhu suffers from? What are symptoms, triggers and treatment options?

Southern superstar Samantha Ruth Prabhu joined a league of popular icons to share their health condition as she made a social media post on how she was recovering from myositis, an auto-immune condition. She confirmed that the condition had been detected a few months ago but that she was now ready to share her vulnerabilities and show that it was okay to be human and cave in sometimes. Here are the need-to-knows.