hello i would advise your husband to seek medical help.
Did he lift something heavy or was it sudden onset of pain?
I have disc problem and sounds like your husband may have developed one too.?
Does he experience any pins or needles, numbness, pain radiating down one or both legs and into big toe?
We can all have pain and sorry for asking questions but there are so many ways to describe how the pain manifests itself, eg: shooting pain/stabbing pain/spasm?
Im not medical just someone who suffers chronic back pain for last three years and what to look for with your husband.
If he is experiencing any of these symptoms he best get checked out by dotor so he can get help.