In most cases, the study of causality in chronic disease can be best summarized as Multifactorial.
In practically all nations, chronic diseases and non-communicable diseases are currently the leading cause of adult mortality, and over the next 10 years, this number is expected to rise by another 17%. A third of all persons worldwide struggle with numerous chronic conditions. In the US, four out of ten persons have two or more chronic diseases, making up six out of ten adults. According to estimates, 35 million of the 58 million fatalities that will occur in 2005 will be caused by chronic illnesses. Leading chronic diseases are largely caused by health-harming behaviors, including cigarette use, inactivity, poor dietary habits, and excessive alcohol consumption. The most prevalent chronic conditions in wealthy nations include, in alphabetical order.
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