Mostly because 1) you probably can’t pronounce them and 2) they don’t really exist.
Germans aren’t hypochondriacs, by the way. They’re Hypochonder.
14. ZIVILISATIONSKRANKHEIT
Zivilisationskrankheit, or “civilization sickness” is a problem caused by living in the modern world. Stress, obesity, eating disorders, carpal tunnel syndrome and diseases like type 2 diabetes are all examples.
Observing Hermann 
I was hoping for a list of crazy compound noun illnesses 🙂
These really are great – you can still make up your own as you go along, though.
I guess I need to learn a few more words first 😉 Oh, wait, maybe I have Freiberuflerstresswabbeln 🙂
Hoch Funf!
Yay! 🙂