What Is a Disease?

dice
I have no idea what this means. I just do as our Benevolent Seed Overlords command

So our Benevolent Seed Overlords pose the question "What is a disease?" This question merely proves that longer questions are usually easier to answer than shorter ones.

So I've decided to change the question to "What is an infectious disease?" (cuz it's my blog). There are two underlying meanings of the word disease:

  1. An organism that lives on or in a host and that harms the health--that is, lowers the fitness--of that host.
  2. The effect of a parasite (the previously described organism) on the unhealthy host.

I like the first definition--or I should say I find it more interesting--because I really don't want to hear about your symptoms (mine, on the other hand, are fascinating to me). The etiological agent is far more interesting than a kvetching human.

More like this

Biology does normativity all the time. There are things that are the "normal" type of state of a species, an organism, an ecosystem, and so on, and things that are abnormal. But the puzzling thing is that all philosophers know, since David Hume, that normativity doesn't develop out of facts. So no…
[A series of posts explaining a paper on the mathematical modeling of the spread of antiviral resistance. Links to other posts in the series by clicking tags, "Math model series" or "Antiviral model series" under Categories, left sidebar. Preliminary post here. Table of contents at end of this post…
One of the things I love about science--but that can also be frustrating--is that every new piece of information leads to a new unanswered question. We've learned so much about microbiology and human disease since the time of Koch and Pasteur, but in many other ways, we're still at square one.…
Thankfully, I don't receive all that much blog-related mail. But this weekend I received several communications about a piece in popular liberal blog. The piece is (ostensibly) about Lyme disease, which coincidentally happens to be one of the topics of my first post here at SBM. In fact, I've…

My pathophysiology professor provided us with an interesting definition of disease once:

"Disease is the absence of health."

Of course, this doesn't really help much, but it certainly explains the problems of the "worried well"...

There's actually a pretty extensive literature addressing this question. And how it's answered turns out to be relevant to quite a number of important practical issues. Prominent among these is the question of the scope of medicine, and thus, the scope of medical expertise and professional duties. It's also of interest to health insurers, who would like to be able to demarcate healthcare from the promotion of various other social goods.

By bob koepp (not verified) on 11 Feb 2008 #permalink