Although health is the main concern of medicine, its exact meaning is not at all clear.
Medicine is more concerned with non-health, known as disease.
Yet not every disease should be regarded as non-health. Many young adults carry in their arteries arteriosclerotic plaques without any apparent health deterioration. Obviously health and disease are not complementary. Rising cancer prevalence with age - Cancer prevalence rises with age, and in some cancers, like that of the prostate, it rises exponentially. Such cancers were called incidental.