I'm guessing he's not pregnant! :>)
I had that when I was pregnant so bad its the worst. I agree with gymdandee!
I guess its all in how its affecting him. Are there any other symptoms?
It sounds like Sciatica! I have a question the leg that has the sensation does your husband keep his wallet in his back pocket of that leg? if yes then don't any bulge in a back pocket can press on the Sciatic nerve he can try benfotiamine you can buy at any health food store.