呕血与黑便都是上消化道出血的症状。上消化道是指屈氏韧带以上的消化器官，

Hematemesis and melena are symptoms of upper gastrointestinal bleeding. The upper gastrointestinal tract refers to the digestive organs above the ligament of Trevor, including the esophagus, stomach, duodenum, and pancreatic and bile duct bleeding. Vomiting blood from the mouth through the stomach is called hematemesis. Hematemesis is also called melena when part of the blood is excreted through the intestinal tract, forming a viscous and shiny tar-like sample. Hematemesis is generally accompanied by melena, and melena is not necessarily accompanied by hematemesis.

Hematemesis and melena are both symptoms of upper gastrointestinal bleeding. The upper gastrointestinal tract refers to the digestive organs above the trochanter ligament, including esophagus, stomach, duodenum, pancreatic duct and biliary tract bleeding. Vomiting of blood from the mouth through the stomach is called hematemesis. Hematemesis at the same time, because part of the blood is excluded from the body through the intestinal tract, forming a sticky, thin and shiny asphalt like, it is called black dung. Hematemesis is generally accompanied by melena, and melena is not necessarily accompanied by hematemesis.

Both hematemesis and black stool are symptoms of upper gastrointestinal bleeding. The upper digestive tract refers to the digestive organs above the Qu's ligament, including bleeding of esophagus, stomach, duodenum, pancreatic duct and biliary tract. Blood vomited from the mouth through the stomach is called hematemesis. At the same time, hematemesis is caused by part of the blood being excreted through the intestinal tract, forming a sticky and shiny asphalt sample, which is called black feces. Hematemesis is usually accompanied by melena, but melena is not necessarily accompanied by hematemesis.