I'm very concerned about the state of her health.

Health = body condition.

But in ESL and my country it is considered as "being fit".And it may be the reason that the healthy means strong. Why can it not have an little effect on you to make the fault sense of it to you?

Health = body condition. What you refer to is 'good health'.

You say we can refer to "health" as "good health", is it?

No—if you mean 'fitness', you must use 'good health'. 'Health' alone does not reveal its quality.

All of us in China or taiwan it considered as being fit no exception. Why are you immune to it??English would be truely terrible.

Don't be ridiculous. We are talking about English vocabulary.

I can see how this could be confusing. The adjective "healthy" implies good health. But the noun "health" can be good or bad.

"Are you generally in good health?" ("Are you healthy?") "No, I've always suffered from poor health. I've been sickly all my life." "She's gotten very thin and pale. I'm worried about her health."

Yes, in the situation given by you, the last line has a sense to me that you mean that "I am worried about the condition of her with regard to her disease". ...........By the way, [be worried about] and [be sorry for / be afraid that] are different from each other in logic?..............Be worried about A --------means be worried on the subject of A;..........................Be sorried for or be

In your line------No, I've suffered from poor health. --------that enlightens me to know the preposition of "from" may show the two directions : 1. one suffers from what ; 2. something or someone protects the one to suffer from what; 3. something / someone prevents the one reaching as far as one's aim, that means keep the one away from reaching as far as one's aim ;