Excerpt from this article:
This condition of faking illness online has a name: “Munchausen by internet,” or MBI. It’s a form of factitious disorder, the mental disorder formerly known as Munchausen syndrome, in which people feign illness or actually make themselves sick for sympathy and attention. According to Marc Feldman, the psychiatrist at the University of Alabama at Tuscaloosa who coined the term MBI back in 2000, people with the condition are often motivated to lie by a need to control the reactions of others, particularly if they feel out of control in their own lives. He believes that the veil of the internet makes MBI much more common among Americans than the 1 percent in hospitals who are estimated to have factitious disorder.