Global warming can indeed cause headaches – although the connection is not fully understood. Scientists have suggested that rising levels of air pollution from global warming can lead to an increase in headaches in certain people. This is likely because air pollution can cause inflammation of the blood vessels in the brain, leading to headaches.
In addition, extreme changes in temperature can cause headaches in some people. As temperatures rise, people may be exposed to uncomfortable levels of heat and humidity, leading to an increase in headaches.
Finally, global warming can lead to an increase in certain allergens, such as pollen. Allergies can cause inflammation in the nasal passages and the sinuses, leading to headache pain.