Disease is probabilistically defined and measured with the attendent problems this brings. Health care demnd is driven largely by illness overlapping with diseas, but it is the illness rather than the disease that drive people to seek medical help.
Most disease is either self-limiting or incurable.
Finally, how we view the world will affect how e respond to it. This is the case for all peoples, in all places, at all times. This included doctors and patients. A limited medical model of disease often fails to overlap with the patient s experience of illness.