Stroke is one of the leading causes of death and disability worldwide.
It happens when blood flow to the brain is interrupted, either by a blockage or a burst blood vessel.
When this happens, brain cells begin to die within minutes. Many people know about common risk factors such as high blood pressure, smoking, and poor diet.
However, scientists are now warning that another major factor is becoming more important: climate change.
A new scientific statement from the World Stroke Organization highlights how changes in the environment are increasing the risk of stroke. This research was published in the International Journal of Stroke and brings together findings from experts around the world.
The researchers explain that extreme weather conditions are not just uncomfortable, but can directly affect the human body in dangerous ways. One of the biggest concerns is extreme heat.
When temperatures rise too high, the body loses more water through sweating. This can lead to dehydration. When the body is dehydrated, the blood can become thicker and flow more slowly. This increases the chance of blood clots forming, which can block blood vessels in the brain and cause a stroke.
Temperature changes also play an important role. Rapid shifts between hot and cold weather can put stress on the body. These changes can affect blood pressure, which is one of the most important risk factors for stroke. High humidity and changes in air pressure can also make it harder for the body to maintain stable blood pressure levels.
The study also points out that climate change is leading to more frequent and severe weather events. These include heatwaves, cold spells, droughts, and storms.
Sometimes these events happen at the same time, creating even more stress on the body. For example, a combination of high heat and dry conditions can increase the risk of dehydration and heat stress, raising the likelihood of stroke.
Air pollution is another major concern. Tiny particles from pollution can enter the lungs and then move into the bloodstream. Once in the blood, they can damage the walls of blood vessels.
This damage can lead to blockages or even cause vessels to break, both of which can result in a stroke. The researchers estimate that more than 20 percent of strokes worldwide are linked to air pollution.
Climate change is making air pollution worse in several ways. Wildfires are becoming more common and more intense, releasing large amounts of smoke into the air. Dust and sandstorms are also increasing in some regions. These events add more harmful particles to the air, which can affect millions of people.
The impact of these environmental changes is not the same for everyone. Older adults are more vulnerable because their bodies are less able to adapt to extreme conditions.
People who work outdoors are also at higher risk because they are exposed to heat and pollution for longer periods. In addition, people living in low- and middle-income countries face greater risks because they may have less access to healthcare and fewer resources to protect themselves.
The researchers stress that climate change is not just an environmental issue, but also a major health issue. They call for urgent action to reduce greenhouse gas emissions, which are the main cause of global warming.
This includes promoting cleaner energy sources, encouraging plant-based diets, and supporting more active forms of transportation such as walking and cycling.
They also suggest practical steps to protect people’s health. For example, hospitals and health systems can include weather alerts in their systems to warn patients about dangerous conditions. Public health campaigns can help people understand how weather affects their risk of stroke and what they can do to stay safe.
In conclusion, this study shows that climate change is increasing the risk of stroke in multiple ways. Extreme temperatures, pollution, and changing weather patterns all put stress on the body and raise the chances of serious health problems.
While more research is needed, the evidence is clear that protecting the environment is also essential for protecting human health. Taking action now could help reduce the number of strokes and save lives in the future.
If you care about stroke, please read studies about how to eat to prevent stroke, and diets high in flavonoids could help reduce stroke risk.
For more health information, please see recent studies about how Mediterranean diet could protect your brain health, and wild blueberries can benefit your heart and brain.
