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Some causes of disease have changed over time, while others are ever present. Medical knowledge has increased and explanations for the causes of illness and disease have changed.

The treatment of illness and disease has changed due to improvements in medical knowledge. Treatments have become increasingly successful. How have attempts to treat illness and disease changed over time?

Medical knowledge has progressed over time and has led to advances in the treatment of illness and disease. How much progress has been made in medical knowledge over the centuries?

Patient care has progressed and led to improvements in the treatment of illness and disease. How has the care of patients improved over time?

Public health and welfare have progressed over the centuries. This has led to improvements in health and life expectancy. How effective have attempts been to improve public health and welfare over time?