Upset, I think it's a symptom of something bigger. I personally associate it with extreme morning sickness that some pregnant women get. It's something that threatens your overall well being but its not the root problem. My husband's problem isn't that he's an alcoholic, he has some other problem that he's trying to treat with alcohol. The alcohol has now become a secondary problem and I'm only privy to that one because we have children together and were living together.
Again, these are only *my* opinions, they're not backed up by research or anything else. That's how I feel based on what I've learned this far.