From the official website:
Hypochondriacs have long had to satisfy their needs for self-diagnosis with medical reference materials written for the masses, but this revolutionary book is dedicated entirely to the hypochondriac's unique perspective on health. The world's worst maladies, conveniently organized by symptom (real or imagined), will ignite even the mildest hypochondriac's fantasy life. We're all going to die of something--why not choose an ailment that's rare and hard to pronounce?
* Profiles of over 300 deadly diseases
* Organized by symptom for ease of self-diagnosis
* At-a-glance ratings system of contagion, pain, suffering, and death
* Fascinating spotlights on terrifying medical phenomena
I personally like this page about brain tumors the most!