Head down. What's the headache?

First of all, head pain, mainly due to low head when cerebral vascular filling, vascular dilation caused by head pain. This is a physiological condition of the performance of headache, do not need special treatment, when the position recovery, symptoms will quickly disappear. Second, vertebrobasilar insufficiency onset, patients will show dizziness, headache, nausea, vomiting and other performance, but also accompanied by neck pain and other performance. After the onset of vascular ultrasound, angiography and other clear diagnosis. Moreover, when hypertension comes on, it will also show head pain, after measuring blood pressure clear diagnosis.