A condition marked by black,tarry stool or vomit composed largely of blood that has been acted on by gastric juices,resulting from a hemorrhage along the digestive tract.

• 黑粪症，由消化道大出血而引起的病症，其特征为排出黑色柏油样粪便或以经胃液分解之血液为主要成分的呕吐物。