We are all terminally ill. It is a matter of time before we all die. Aging and death remain almost as mysterious as ever. We feel awed and uncomfortable when we contemplate these twin afflictions. The person must FEEL bad, must experience discomfiture for his condition to qualify as a disease.
Some diseases are manifest and others are latent or immanent.
They experience no dis-ease, they report no symptoms, no signs are evident. Carriers threaten others and must be isolated or otherwise neutered. The threat inherent in them must be eradicated. This is a dangerous moral precedent. Moreover, the distinction between the psychic and the physical is hotly disputed, philosophically.