I think I might have seasonal affective disorder. What are the symptoms?
user
Sure. This website provides a checklist of the symptoms, if you want to check to see if you have any. The list includes things like “tiredness or fatigue”, “feelings of guilt or failure”, “low self-esteem”, “change in appetite or weight”, “sleeping problems or early waking”, and many others. Here’s a sample:

“It's often difficult to work, or concentrate at school, or perform daily activities.”

But for a diagnosis, you need to have all the symptoms listed for at least two weeks.
assistant
Can doctors diagnose seasonal affective disorder, or is the validity of the issue not accepted in mainstream medical establishment?
user
It is a recognized syndrome, and it can be diagnosed, but there is ongoing debate about how best to define it and what treatment might work.
assistant
I think I might have seasonal affective disorder. What are the symptoms?
user
Sure. This website provides a checklist of the symptoms, if you want to check to see if you have any. The list includes things like “tiredness or fatigue”, “feelings of guilt or failure”, “low self-esteem”, “change in appetite or weight”, “sleeping problems or early waking”, and many others. Here’s a sample:

“It's often difficult to work, or concentrate at school, or perform daily activities.”

But for a diagnosis, you need to have all the symptoms listed for at least two weeks.
assistant
Can doctors diagnose seasonal affective disorder, or is the validity of the issue not accepted in mainstream medical establishment?
user
This is a pretty complex question, which I will have to go back to research.  But in general, diagnostic criteria of a mental disorder have to be established with scientific testing.  So if a doctor’s diagnosis of seasonal affective disorder involves saying “I have some patients with seasonal affective disorder and I think you might be one, so I think you’re probably seasonal affective disorder”, this isn’t appropriate, because it isn’t properly established science.  Even if the doctor’s intuition is correct, it’s still not a proper diagnosis.
assistant
I think I might have seasonal affective disorder. What are the symptoms?