Hello Yoko, welcome to EnglishForward. Thank you for registering.

Can I say, The reason I have improved my OCD? This is not a complete sentence. It is a noun phrase.

I have really improved my OCD by myself by shifting thoughts. This is a complete sentence, but I have no idea what it says. What is OCD?

Thank you so much for your reply, you are so kind.

Well OCD is Obsessive Compulsive Disorder.

I have written a book in Japanese.

The books name is

The reason I have improved the symptoms of OCD

But I am not quite sure, if I could say.

Because I feel like maybe,

The reason why my syptoms of OCD has improved, is more natural.

Just I want to emphasize that I really did improve the symptom of OCD with my own effort.

So, I did not h

I am so sorry.

The reason why my symptoms of OCD have improved.

Maybe

The reason my OCD has improved the symptoms.

Suggestion: Reasons attributed to my improvement of OCD.

The symptoms of my obsessive-compulsive disorder have become less severe.
I exhibit fewer symptoms of my obsessive-compulsive disorder.
I have cured my obsessive-compulsive disorder. I have no more symptoms.
I am less obsessive and less compulsive.
My behavior is more normal and less abnormal.
I feel calmer and more peaceful.

Use "how" not "the reasons". I would guess the reason (why you did something) is because the way OCD controlled your life bothered you.

If you say "the reasons it improved" it could easily mean "I took the right medicatio."

Simply call it "How I Overcame OCD."

Thank you so much for your kind reply.

Not exactly overcame OCD. All of human mind wander...so.

How sounds so good.

I'm also thinking the reason my symptoms of OCD have improved

Because I used method of cognitive therapy.

Oh, the reason could be taken as medication. Mmm, I see now. Yes, how sounds good idea. I could not find this by myself at all. I'm so glad and appreciated for this to you. Thank you!!!