Evidence-based medicine combines clinical evidence and experience so that doctors and patients can make the best decisions on an individual basis.
Epidemiology is the study of the various factors influencing the occurrence, distribution, or prevention and control of disease, injury, and other health-related events in a defined human population.
Risk factors are those factors linked to poor health, disability, disease, or death. Generally, risk factors can be classified as behavioural, physiological, demographic, environmental, or genetic. Reducing exposure to risk factors would improve global health and life expectancy.
Epidemiology is the underlying and basic science of public health. It could be defined as any research of health events in populations, including: how many are affected by such events, is the risk increasing or decreasing, what is the relevance of the problem and how could it be prevented.
Four concepts are important in determining the use of medicine in the treatment of diseases: Symptoms, diagnosis, mechanisms, and targets.