If you have migraines, the thermometer might be your best friend! We found this intelligence for your health on MSN:
Sudden changes in pressure, humidity, and temperature can all trigger migraines. Warning signs include a throbbing pain in one side of the head, nausea, and sensitivity to light and sounds. So, experts suggest paying attention to the weather report and keeping medications handy. Also, people who think weather is a headache trigger for them should keep a 'headache diary' and a list of what the weather was like at the time of the attack. That way you'll be able to anticipate future migraines and take action before an attack gets out of control.
Scientists are still foggy on why weather triggers migraines, but studies show that certain conditions can affect levels of the brain chemical serotonin. Aside from being a mood-lifting, feel-good chemical, serotonin regulates how blood vessels in the brain expand and contract - and that's thought to be the key in the migraine process.
The same holds true for changes in atmospheric pressure which can effect the size of blood vessels in the brain. So when the barometer fluctuates, it can trigger a headache. This is why some migraine sufferers say they can actually predict a thunderstorm.