Relationship between cold weather and illness in humans
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Cold Weather and Human Illness: Mortality and Morbidity Risks
Cold Weather, Mortality, and Vulnerable Populations
Multiple studies show that cold weather, especially during cold spells, is linked to increased mortality in humans. The risk is particularly high for older adults, women, and people with pre-existing health conditions or lower socioeconomic status. Cold spells lasting at least two days with very low temperatures significantly raise the risk of death from all causes, especially from cardiovascular and respiratory diseases. The effects of cold weather on mortality can last up to two weeks after the cold event, and the impact is more pronounced in rural areas and among the elderly and less educated populations 129.
Cardiovascular Disease and Cold Exposure
Cold exposure is a well-established risk factor for cardiovascular disease. Every 1°C drop in temperature increases cardiovascular mortality and morbidity, with the strongest effects seen in coronary heart disease and aortic aneurysm or dissection. Cold spells can increase cardiovascular mortality by over 30%. The risk is higher in certain climate zones, lower-income countries, and among older adults 39.
Respiratory Illnesses and Cold Weather
Cold weather also increases the risk of respiratory illnesses, including pneumonia, influenza, and chronic obstructive pulmonary disease (COPD). Hospital admissions for these conditions rise during and after cold spells, with the elderly being especially vulnerable. People with asthma or allergic rhinitis are more likely to experience cold-related symptoms and functional disability, and their risk of health problems increases significantly during cold weather 2578+1 MORE.
Cold Weather and Infectious Disease Spread
Cold waves can accelerate the spread of infectious diseases, such as COVID-19. During cold spells, the number of cases and deaths from infectious diseases can rise sharply, especially among the elderly and those with underlying health conditions. This highlights the need for targeted public health responses during extreme cold events .
Lagged and Seasonal Effects
The health impacts of cold weather often have a lagged effect, with increased hospital visits and deaths occurring days or even weeks after the cold event. The magnitude and timing of these effects can vary by season, with some studies noting the largest increases in respiratory illness visits in spring and summer following cold air events, even though the overall incidence is highest in winter 1210.
Conclusion
Cold weather is strongly associated with increased illness and death in humans, particularly from cardiovascular and respiratory diseases. The elderly, women, people with pre-existing conditions, and those in rural or lower-income areas are most at risk. Cold spells can also worsen the spread and severity of infectious diseases. These findings underscore the importance of early warning systems and targeted interventions to protect vulnerable populations during periods of extreme cold.
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