Many people think of climate change as something that affects the weather, the oceans, or wildlife. However, scientists are now warning that it is also having a direct impact on human health, especially the brain.
A new report from the World Stroke Organization shows that changes in the environment are increasing the risk of stroke and making outcomes worse for patients.
This report was published in the International Journal of Stroke and was created by experts from many countries. It brings together the latest research on how environmental factors linked to climate change affect stroke risk.
Stroke occurs when blood cannot reach part of the brain. This can happen when a blood vessel is blocked or when it bursts. Without enough blood, brain cells are damaged or destroyed. Stroke is one of the leading causes of death and disability worldwide, and most cases occur in low- and middle-income countries.
The researchers found that extreme temperatures are a major factor. Very hot weather can cause the body to lose fluids quickly, leading to dehydration. When this happens, the blood becomes thicker and more likely to form clots. These clots can block blood vessels in the brain and cause a stroke.
Cold weather can also be harmful. It can cause blood vessels to narrow and increase blood pressure. Sudden changes in temperature can put additional strain on the body. These changes are becoming more common due to climate change.
Humidity and air pressure are also important. Changes in these conditions can affect how the body regulates blood pressure. High blood pressure is one of the main causes of stroke, so anything that affects it can increase risk.
The study also highlights the role of air pollution. Pollution from vehicles, factories, and natural events like wildfires releases tiny particles into the air. These particles can enter the lungs and then the bloodstream. Once inside the body, they can damage blood vessels and increase the risk of both blocked and ruptured arteries in the brain.
Climate change is making air pollution worse by increasing the number of wildfires and dust storms. These events release large amounts of harmful particles into the air, affecting large populations.
Certain groups are more at risk. Older people are more sensitive to temperature changes and pollution. Outdoor workers are exposed to extreme conditions for longer periods. People in lower-income countries may have limited access to healthcare and fewer resources to protect themselves from environmental risks.
The researchers emphasize that these risks are not separate but often occur together. For example, a heatwave combined with poor air quality can have a stronger effect than either factor alone. These combined effects can significantly increase the chances of stroke and death.
To address these risks, the report calls for strong action to reduce greenhouse gas emissions. This includes using cleaner energy, improving city planning, and encouraging healthier lifestyles. The researchers also suggest better communication between weather services and healthcare systems so that people can be warned about dangerous conditions.
In addition, educating the public is very important. People need to understand how weather and pollution affect their health and what steps they can take to reduce their risk.
In summary, this study shows that climate change is not just an environmental issue but a serious health concern. It increases the risk of stroke through multiple pathways, including heat, pollution, and unstable weather conditions. While more research is needed, the findings highlight the urgent need for action to protect both the planet and human health.
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Source: World Stroke Organization.
