What's the difference between 治す{なおす} and 治る{なおる}?


My dictionary says they are both cure/fix, so I am wondering what the
difference is and how to use them?

Is it an active/passive difference, or transitive/intransitive? Or just a
subtle nuance? I couldn't find a good example of usage.

I found [this](https://japanese.stackexchange.com/questions/70/what-is-the-
difference-in-nuance-and-usage-of-the-two-kanji-forms-
for-%E3%81%AA%E3%81%8A%E3%81%99-naosu) question, but it just refers to the
different kanji, not the different words.

Thanks




`治す` is transitive.

> 傷を治す  
>  to heal a wound
>
> ほとんどの病気は薬を使わずに治すことができる。  
>  Most ailments can be cured without medicine.

`治る` is intransitive.

> 風邪が治った  
>  my cold got better
>
> 傷が治らないので、私はまた病院に行った。  
>  My wound did not heal, so I visited the hospital again.




`治す` is transitive.

> 傷を治す  
>  to heal a wound
>
> ほとんどの病気は薬を使わずに治すことができる。  
>  Most ailments can be cured without medicine.

`治る` is intransitive.

> 風邪が治った  
>  my cold got better
>
> 傷が治らないので、私はまた病院に行った。  
>  My wound did not heal, so I visited the hospital again.

