神(shen)(shen)經(jing)性(xing)厭食(shi)(shi)(shi)(shi)亦稱神(shen)(shen)經(jing)性(xing)食(shi)(shi)(shi)(shi)欲不振,以(yi)(yi)長期(qi)原因不明(ming)的厭食(shi)(shi)(shi)(shi),顯著的體(ti)重減輕為(wei)(wei)(wei)其特(te)征。發(fa)(fa)病(bing)年(nian)齡在10歲以(yi)(yi)上,女性(xing)青少年(nian)為(wei)(wei)(wei)多見,若不及(ji)時(shi)治療,可(ke)導(dao)致嚴(yan)(yan)重的營養不良與(yu)極度衰竭,影響青少年(nian)的身心健康與(yu)發(fa)(fa)育。原因還未完全查明(ming)的精神(shen)(shen)障礙,特(te)征是(shi)為(wei)(wei)(wei)保(bao)持(chi)體(ti)型瘦削(xue)而長期(qi)過分節食(shi)(shi)(shi)(shi)或(huo)拒食(shi)(shi)(shi)(shi),以(yi)(yi)致造成(cheng)(cheng)體(ti)重銳減、營養缺(que)乏、代謝(xie)和內分泌(mi)功能紊亂,嚴(yan)(yan)重時(shi)可(ke)危(wei)及(ji)生(sheng)命。多見于青少年(nian)期(qi),女性(xing)患病(bing)率遠(yuan)高于男(nan)性(xing)。神(shen)(shen)經(jing)性(xing)厭食(shi)(shi)(shi)(shi)癥(zheng)又稱精神(shen)(shen)性(xing)厭食(shi)(shi)(shi)(shi)癥(zheng),簡稱為(wei)(wei)(wei)厭食(shi)(shi)(shi)(shi)癥(zheng),它是(shi)一(yi)種(zhong)(zhong)時(shi)間患者自己有意造成(cheng)(cheng)的體(ti)重明(ming)顯這種(zhong)(zhong)下降至正常生(sheng)理(li)標準(zhun)體(ti)重以(yi)(yi)下,并極力維(wei)持(chi)針對這種(zhong)(zhong)狀態的一(yi)種(zhong)(zhong)心理(li)生(sheng)理(li)障礙。