While this product does indeed have 100 different fantasy diseases, they are titles only. It leaves any further information up to your imagination. I was expecting at least a blurb for each disease, but was disappointed.
In addition, some of the diseases sound just plain silly, such as Asymmetrical Humors or Sibilant Saliva or Infectious Dessication. They just don't match with their legitimate definitions. There are plenty of good diseases listed to make this purchase worth your dollar, you just need to add a little elbow grease to make them work.