Swelling can cause pain. But it's more likely that your husband is still experiencing surgical pain. After all, he's only a couple of weeks out and his body is still healing. Be sure he doesn't continue any activity when pain starts. That's very unwise and could result in swelling and even more pain.
Did you read the articles that were linked for you earlier in this thread? The blue links? The information there should help you understand how recovery will progress.
Did you read the articles that were linked for you earlier in this thread? The blue links? The information there should help you understand how recovery will progress.