病来如山倒，病去如抽丝

病来如山倒，病去如抽丝

Literally means:

illness comes as fast as mountain falls down, but goes as slowly as unraveling a cocoon

Actually means:

It means that some diseases break out as fast as a mountain falls down, but recovery takes as long as unraveling a cocoon. It often shows that illness comes fast but goes slowly, and it is used to persuade people to be patient about the healing process. It is also used to connote the feeling that recovery is too slow.

形容某些病发作起来就像山倒下来一样快，可是治病过程就像从蚕茧抽出蚕丝一样，要经过 较长的时间。多用来说明病来得快，去的慢， 劝人要耐心治病。也用来感叹病好得太慢了。