The long-lasting illnesses of a disease can be explained by a persistent existence of the connective disease and organism in the host. The epidemiology of these enduring diseases deals with the etiology, evasion, transmission, typical antecedents and helpful results of persistent disorders of well-being of humans. The role of the epidemiology of enduring diseases is not as broadly recognized. Chronic disease inhibition and health promotion plans are one way to improve epidemiological capability. Chronic disease program executives and public health decision-makers may have a slight understanding of the undeveloped epidemiological functions of chronic disease.