“I was so in my head that something was wrong with me.” In recent years, discussions about mental health have proliferated on social media, particularly on TikTok, where the format allows for easily digestible, intimate videos that appear in a never-ending algorithmic feed.A number of mental health providers say that they are seeing an uptick in teenagers and young adults who are diagnosing themselves with mental illnesses — including rare disorders — after learning more about the conditions online.But “if you’re organized and you have structure and you like things a certain way and you’re functioning, you don’t have obsessive-compulsive disorder — you’re organized,” Ms. Barsch said.The American Foundation for Suicide Prevention And when clients become fixated on a particular diagnosis, providers say they must walk the fine line between offering a reality check and finding a way to support their clients, who are often deeply concerned.But part of what makes diagnosis so complicated is that the same disorder can express itself in a child, adolescent and adult very differently — in other words, the same list of symptoms does not apply to every age group."