Leave = MC?

Hubby’s 5 days leave started yesterday and that unlucky guy hurt his back. And the worst thing is that he did not even know how he hurt it. I think he could have strain his back muscles last weekend but he did not even know that.
Last Saturday, he was trying to put Sherry into the playpen and immediately, he felt the strain on his back. I told him many times that to let her down into the playpen in a standing position instead of bending ourselves to lower her down in the sitting position. He seems to ignore my advice and he is the type of person whom the threshold of pain is at its minimum. So yesterday, for no rhyme of reason the muscles decided to start to ache and give him pain, and that stubborn man, still refused to go the doctor. I was wondering was he thinking that the pain will go away on its own! Hai.. What a silly thinking!
When I was home last evening, then he told me that he had strain his back muscle (and still refused to go to the doctor). MIL insisted him to apply some Chinese medication on the aching back and that has to be applied for consecutive 3 days and 3 nights. The medication will only be removed after 12 hours, then air the area and later continue with the medication again. Hope this will heal!
Hai… This is not the first time that his leave becomes medical leave… What does this implies? Cannot go on long leave???