This is the title of a poetry collection that caught by eye when browsing at the library. This is the kind of phrase that makes one think about its profundity but after sometime it becomes just another way of describing the mundaneness of being (a la Marvin the paranoid android).
A fatal disease is that leads to certain death. How, when and where the death may occur is what makes the difference. The person may try to prolong their life with medical aids but cannot prevent the inevitable. Likewise one may live like one wishes because in the end, when all ends, life too, ends.
Why does the above not make any sense at all?? Oh well, nevermind. Life is a fatal disease.