Take for example ADHD. How can a psychologist tell the difference between someone who’s just super hyper and someone who has ADHD?
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It’s all definitions. There really isn’t any very good way of measuring any of this. Contrary to many people’s belief, Psychology is NOT a science. They do perform experiments, but as mentioned there is no good way of measuring anything. Psychology and all the “soft” science have what is known as the [Replication Crisis.](https://en.wikipedia.org/wiki/Replication_crisis) Basically they have a hard time reproducing the results of experiments which is at the foundation of the scientific method.
As one person said, they created a book (the DSM) where they can cross reference a list of symptoms against a list of symptoms that they have defined comprise a disorder. If you have match a certain number of symptoms they’ll say you have that disorder.
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