编辑同志:我家宝宝四个月大了,可是鼻子一直流鼻涕,也未见其他不适,请问这是怎么回事?成都项××项读者:婴幼儿本身鼻腔相对较小,黏膜柔软易肿胀,鼻窦口狭长窄小,易被堵塞。黏膜下血管较丰富、通透性强。一旦鼻黏膜受到炎症、过敏原、冷空气或异物刺激时,容易肿胀,继而出现鼻塞;而丰富的血管网渗出分泌物增多,鼻涕也就来了。家长可以通过观察鼻涕的黏稠度及颜色变化,来初步判断原因——清水样鼻涕:最多见。多见 Edit comrades: my baby four months old, but the nose has been runny nose, and no other discomfort, may I ask what is going on? Chengdu entry ×× items readers: infants and young children itself is relatively small nasal cavity, mucous membrane is soft and swollen, Sinus narrow stenosis, easily blocked. Submucosal blood vessels more abundant, strong permeability. Once the nasal mucosa by inflammation, allergens, cold air or foreign body stimulation, swelling easily, and then appear stuffy nose; and rich vascular network exudation secretions, the nose will come. Parents can observe the nasal mucus and color changes, to determine the reasons for the initial - clear water sample nose: the most common. More common