Causes of mortality
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Leading Causes of Mortality Worldwide
Research consistently shows that the main causes of mortality globally are non-communicable diseases (NCDs), communicable diseases, and injuries. Among NCDs, cardiovascular diseases (especially ischemic heart disease and stroke), cancers, chronic respiratory diseases, and diabetes are the most significant contributors to death worldwide 3467+1 MORE. Communicable, maternal, neonatal, and nutritional conditions—such as lower respiratory infections, diarrheal diseases, HIV/AIDS, malaria, and neonatal disorders—remain major causes of death, particularly in low- and middle-income countries and among children under five 3567+1 MORE. Injuries, including those from road traffic accidents, violence, and war, also account for a substantial number of deaths, especially among younger populations and in certain regions 67810.
Trends and Shifts in Mortality Patterns
Over recent decades, there has been a global shift from deaths caused by infectious diseases to those caused by NCDs, largely due to improvements in public health, vaccination, and medical care 3678+1 MORE. While age-standardized death rates for many leading causes have declined, the absolute number of deaths from NCDs has increased because of population growth and aging 67810. In high-income countries, reductions in cardiovascular and cancer mortality have contributed to increased life expectancy, while in low-income regions, progress in reducing child deaths from infectious diseases has been significant 3567+2 MORE.
Major Predictors and Risk Factors for Mortality
Key risk factors for premature death include aging, smoking, underweight, diabetes, and osteoporosis 2467+1 MORE. Diabetes and osteoporosis, in particular, are strong predictors of all-cause and cause-specific mortality, with notable differences between men and women . Smoking remains a major risk factor for mortality, especially among men 24. Increases in obesity and type II diabetes are emerging as significant threats to future improvements in mortality rates, even as some risk factors like smoking and hypertension decline in certain countries .
Child Mortality: Causes and Progress
For children under five, the leading causes of death are preterm birth complications, pneumonia, and intrapartum-related complications 5710. Significant reductions in deaths from pneumonia, diarrhea, and measles have driven much of the progress in child survival, but neonatal causes and congenital conditions have seen slower improvement 5710. Sub-Saharan Africa continues to bear a disproportionate burden of child mortality 57.
Regional and Country-Specific Patterns
While global trends show a shift toward NCDs, regional differences remain. In countries like Brazil, reductions in infectious disease mortality have increased life expectancy, but violence and injuries have become more prominent causes of premature death, especially among men . In developed countries, circulatory diseases, cancer, respiratory diseases, and external causes (such as accidents) are the main groups of causes of death 148.
Mortality in Non-Human Populations
In North American large and medium-sized mammals, humans are the leading cause of mortality, primarily through hunting and vehicle collisions, followed by natural causes like predation . This highlights the significant impact of human activity on animal populations .
Conclusion
The causes of mortality are diverse and vary by age, region, and socioeconomic status. Non-communicable diseases are now the leading causes of death globally, but communicable diseases and injuries remain important, especially in specific populations and regions. Risk factors such as aging, lifestyle choices, and chronic conditions play a major role in shaping mortality patterns. Continued progress in reducing mortality will depend on addressing both traditional and emerging health risks, as well as adapting strategies to local contexts.
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