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　　花??(hua)粉??(fen)經(jīng)??(jing)呼??(hu)吸??(xi)道??(dao)吸?(xi)入??(ru)后?(hou)??，首??(shou)先??(xian)到??(dao)達(dá)??(da)上??(shang)呼??(hu)吸??(xi)道??(dao)??，引??(yin)起??(qi)鼻??(bi)癢??(yang)、發(fā)??(fa)作??(zuo)性??(xing)噴??(pen)嚏??(ti)、大??(da)量??(liang)清??(qing)水??(shui)樣?(yang)鼻?(bi)涕?(ti)和??(he)鼻?(bi)塞??(sai)等??(deng)過??(guo)敏??(min)性??(xing)鼻??(bi)炎??(yan)的?(de)癥?(zheng)狀??(zhuang)??。??　　花??(hua)粉?(fen)過??(guo)敏??(min)又??(you)叫??(jiao)花??(hua)粉?(fen)癥??(zheng)、枯??(ku)草??(cao)熱??(re)??，主??(zhu)要??(yao)是??(shi)由??(you)于??(yu)對(duì)??(dui)植??(zhi)物??(wu)花??(hua)粉??(fen)存??(cun)在??(zai)過??(guo)敏??(min)現(xiàn)??(xian)象??(xiang)??，并??(bing)對(duì)??(dui)眼??(yan)、鼻??(bi)、呼??(hu)吸??(xi)道??(dao)、皮?(pi)膚??(fu)等??(deng)產(chǎn)?(chan)生??(sheng)影??(ying)響??(xiang)??。?該??(gai)類??(lei)疾??(ji)病??(bing)的??(de)過??(guo)敏??(min)原??(yuan)是??(shi)花??(hua)粉??(fen)??，過??(guo)敏??(min)原??(yuan)傳??(chuan)播??(bo)的??(de)媒??(mei)介??(jie)主??(zhu)要??(yao)是??(shi)風(fēng)??(feng)??。在??(zai)我??(wo)國(guó)??(guo)??，不??(bu)同??(tong)地?(di)區(qū)??(qu)的??(de)氣??(qi)傳??(chuan)花?(hua)粉??(fen)植??(zhi)物??(wu)季??(ji)節(jié)??(jie)分??(fen)布??(bu)特??(te)征??(zheng)因??(yin)氣??(qi)候??(hou)條??(tiao)件?(jian)、植??(zhi)物??(wu)的??(de)物??(wu)候??(hou)條??(tiao)件??(jian)特?(te)征??(zheng)不??(bu)同??(tong)??，存??(cun)在??(zai)一??(yi)定??(ding)差??(cha)異??(yi)??。對(duì)??(dui)于??(yu)北??(bei)京??(jing)來?(lai)說?(shuo)??，氣??(qi)傳??(chuan)花??(hua)粉??(fen)植??(zhi)物??(wu)的??(de)盛??(sheng)花??(hua)期??(qi)主??(zhu)要??(yao)分??(fen)為??(wei)2個(gè)??(ge)高??(gao)峰??(feng)期??(qi)??，那?(na)么??(me)花??(hua)粉??(fen)過??(guo)敏??(min)的??(de)流??(liu)行??(xing)也??(ye)就??(jiu)相??(xiang)應(yīng)??(ying)存??(cun)在??(zai)兩??(liang)個(gè)??(ge)高??(gao)發(fā)??(fa)期??(qi)??。。