河南郑州读者阎某来信说:我最近老是打喷嚏,一打就连着两三个,然后就有无色透明的鼻涕流出。这一症状已经持续两三个月了,特别是在温度变化的时候(如从室内到太阳下或是进入空调房的一瞬间)更易发生。开始以为是感冒了, Zhengzhou, Henan readers Yanmou letter said: I’ve always been sneezing, a dozen even after two or three, and then there is colorless and transparent nose and stream out. This symptom has lasted two or three months, especially when the temperature changes (such as from the room to the sun or into the air-conditioned room for a moment) is more likely to occur. Began to think it is a cold,