Some are which is why it is always good to be educated about these things, and whenever possible, get a 2nd and even a 3rd opinion.

There are no blood tests for these diagnoses, so there is definitely a fair amount of subjectivity to diagnosis.

What you hope for is an experienced professional who doesn't jump to a diagnosis too quickly, who is willing to look at the various possibilities and to investigate them with you.

I have most respect for the professionals who are willing to say "I feel this is probably what is going on here, but this is my second suspicion. Let's try this, but watch and see how things develop."

My pdoc initially diagnosed me with major depressive disorder, but over time and with getting to know me and my history in more depth, he changed his diagnosis to bipolar disorder. Even then, because he was having so much difficulty stabilizing me, he insisted I go for more comprehensive testing AND for a 2nd opinion. He was quite willing to hear what other professionals had to say about my diagnosis and treatment. As it was, everyone concurred with his diagnosis which helped clarify things not only in his mind but in mine also, and he got a few helpful suggestions along the way as well.