众所周知，使血管扩张的物质，如酒精，可以导致血管性头痛。
It is known that substances that dilate blood vessels, like alcohol, can cause vascular headaches.
当一个健康人在紧张时，神经系统会激发血管扩张，使血液循环增加，以满足身体的需要。
In a healthy person who is under stress, the nervous system triggers a widening in the blood vessels so that blood circulation increases to meet the body's needs.
有些药品声称能扩张血管，但并没有明确证据表明它真的能明显地做到这一点，并使病人的生活质量上升。
Claims are made for some tablets that dilate the blood vessels but there is little evidence that they make a significant difference, enough to improve the quality of life.
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