What kind of diseases affecting inflation exist in the imaginary world?
Let's throw in only diseases first, with traumas it's more or less clear.
How is disease called?
How long and how hard is it cured?
What does it do?
As a starter...
Right here on BI, making deflation impossible and dooming a person to be a pool toy forever is attributed to an imaginary disease in many posts on this forum.
Also, it's impossible to ignore HIVS by HeliumGirl77
Blowing up from arousal is mentioned in maaany stories - call it disease or not. I'd call it such.
And from myself:
Inability to inflate - inflatophobia (?). It is a very dangerous disease! If you would get filled with a helium tank or two, you would (goodness me!) receive internal injury and would die in a very painful way instead of happy floating. So you have to avoid any means of inflation - in the world where they are plenty. Shouldn't be too hard to cure - may be a few days on pills at home, or a week on legs. And should manifest itself in a visible way - so that people know when to kick their pump deep under the bed. ^_^
Putting on air. Vice versa - prolonging life when a disease has no cure. In inflated state there's no insides, metabolism is very slow in gas, and any disease would hybernate. So people with cancer, AIDS and such are put on air - and live as balloons until (they pop) the cure is found. Deflating for special occasions to spend a precious day with the family, then getting on air again.
My idea of an inflation disease would be the "Midas Touch". Physical contact with anyone would result in the individual swelling up where they are being touched.
this would count as a disorder or disability, but there could also be a syndrome where the lungs have no limit on how much oxygen taken in. you could just keep inhaling, causing the body to expand.