I think the term "hypochondriac" has been misused so often by so many for so long that it has come to mean the wrong thing in the minds of most people. I used to think it was essentially just somebody imagining that they were sick without any actual symptoms to make this plausible. I didn't realize that it was rooted in something much more real, with actual physical symptoms. Health Anxiety is better because it at least communicates the psychological aspect of the anxiety, but not much better IMO because it still fails to address the existence of actual symptoms. Most people with health anxiety don't just imagine that they are sick; they actually ARE sick because their anxiety makes them sick. Or they may have anxiety about some other unrelated symptom, and the anxiety causes additional symptoms. The point being, we aren't just imagining the symptoms or pretending to be sick, yet I think that's what many people mistakenly assume with the word "hypochondriac," which is why I don't like to use it.