英语翻译
问题描述：
英语翻译
可以是用自己的话把它解释一下,也可以说的比较官方.
答
Gastroesophageal reflux disease (GERD)
GERD is usually caused by changes in the barrier between the stomach and the esophagus,including abnormal relaxation of the lower esophageal sphincter,which normally holds the top of the stomach closed,impaired expulsion of gastric reflux from the esophagus,or a hiatal hernia.These changes may be permanent or temporary.
FROM WIKIPEDIA