In English, medical treatment means medical treatment, which means that I am sick and I want treatment. But health care means that I am still healthy, so I need to pay attention to it and not lose it.
If I want to express "health care with medical function", I can say "medical care"
I suggest you go to the English website to read more about health care, which will be of great help to you. If you don't know, you can go to Yahoo English and search in English.