If you have an undetermined health problem, you see a doctor, who makes a diagnosis. At least that’s how it used to be. Nowadays, in the age of social media, self-diagnosis – most notably of mental illnesses – has become common. On platforms such as TikTok and Instagram, people report how they self-diagnosed, say, attention-deficit/hyperactivity disorder (ADHD) or autism, which, to be clear, isn’t a mental illness. Many describe their symptoms and tell their tale of suffering. Some encourage others to do the same. Mental health issues have been discussed on social media for quite a while. Suff…