We actually know much more about secondary headaches.
These are caused by other health problems, with triggers ranging from dehydration and caffeine withdrawal , to head and neck injury and heart diseases.
Doctors have classified over 150 diagnosable types,all with different potential causes, symptoms, and treatments.
But we'll take just one common case––a sinus infection––as an example.
The sinuses are a system cavities that spread behind our foreheads, noses, and upper cheeks.
When our sinuses are infected, Our immune response heats up the area,roasting the bacteria and inflamming the cavities well past their usual size.
The engorged sinuses put pressure on the cranial arteries and veins,as well as muscles in the neck and head.
Their pain receptors, called nociceptors trigger in response, cueing the brain to release a flood of neuropeptides that inflame the cranial blood vessels, swelling and heating up the head.
This discomfort paired with hyper-sensitive head muscles, creates the sore, throbbing pain of a headache.
secondary 继发性(由其他疾病引起的)
dehydration 极度缺水
caffeine withdrawal 咖啡因戒断反应
sinus infection 鼻窦炎
cavity 空腔
cranial 头颅的
artery 动脉
vein 静脉
nociceptor 痛觉感受器
a flood of 大量的
