What do you see a "diagnosis" as being, exactly?
I interpret this question to mean, 'what's a diagnosis to be used for?'
So, people do seek out ways to communicate about things they experience. To me, a diagnosis provides a way to understand and hopefully remedy a set of symptoms that are distressing.
Let's say you've got a stuffy nose, runny eyes, but no fever or aches, and a sore throat that comes and goes, plus you feel worse after you eat. You'd like relief. But how to go about getting relief? And it sounds like maybe a cold, except for the eating part. What's up with that? Related, or not?
You want a treatment plan - and you wonder if other people have felt that way, and if so, is there a name for feeling all those things? Are all the things actually related?
After you have tests to rule out infections, and probably end up seeing an allergist, you might be diagnosed with seasonal allergies to pollen, and put on benadryl. Stuff gets better. But you still have the sore throat, and the food problem. You go through a whole bunch of scratch tests, but they can't find a food allergy. You run out of tests to take; no-one knows what it is - until someone puts it together with being acid reflux. You go to an ENT, you get scoped, the diagnosis is confirmed, and you adjust your diet, get some OTC acid-reducer, and feel much better.
A diagnosis is a name for a clump of symptoms. While searching for a diagnosis, you are dealing with finding the right 'fit' for your symptoms. Having a partial diagnosis, or a wrong diagnosis, can lead to lots of dead-ends. It's all in service to feeling better. It assists physicians in knowing what else to look for, and rule out - having one symptom of strep throat means it's very likely not strep throat, but you have the test to rule it out anyway.
In mental health, we don't have the objective measures - tests - to rule things out, or in. We have words for feelings, shades of meaning, things we don't always understand. But having a structure - diagnoses - is an attempt to make it as coherent as possible, and a way to keep track of how things change as research slowly happens.
That's what I think a diagnosis is, and what it's for. Super-wordy.
A good diagnosis:
- reflects the most current scientific understanding of a condition
- captures with accuracy the experience of the ill person
- Points the way towards the most effective treatment (most effective being the one that will provide the most relief with the least amount of additional suffering).
I think that applies to any health condition, not just mental health.