The prominent symptoms of jaundice hepatitis B are general fatigue, loss of appetite, nausea, vomiting, especially aversion to greasy food, upper abdominal congestion and fullness, and yellow urine resembling strong tea water. It may be caused by excessive bilirubin in the blood due to liver disease or hemoglobinuria due to intravascular hemolysis (e.g., paroxysmal sleep hemoglobinuria). The former diagnosis can be confirmed by examination of liver function, while the latter can be confirmed by laboratory tests, acidified serum hemolysis test (Ham test), sugar water test, snake venom factor hemolysis test, urine occult blood or urine iron-containing hemoglobin. All human urine is pale yellow in color. It is more clear when it is cold and yellow when it is hot, which is related to sweating and how much water is drunk, but can also change with diet. If the intake of acidic diet, the urine color is dark, such as the diet is alkaline, its urine color is light. Sometimes the urine color will also appear dark yellow when a few tablets of riboflavin are taken orally. Changes in urine color like these are extremely short-lived and recover quickly on their own. Yellow-brown urine should be distinguished from bilirubinuria or urobilinuria. In bilirubinuria, the bile ducts inside or outside the liver are often blocked by inflammation, tumors, or stones, causing increased bile duct pressure, bile duct rupture, and bile overflow, resulting in sodium bilirubin entering the body circulation. When sodium bilirubin exceeds a certain amount, bilirubinuria occurs. Urobilinuria, often due to liver damage, causes an increase in intestinal absorption of urobilin and enters the urine, then urobilinuria occurs. Or in patients with hemolytic anemia, when a large number of red blood cells are destroyed, so that a large amount of urobilinuria is absorbed into the portal circulation through the intestinal wall, and because the liver cannot turn the excess urobilinuria into bilirubin, urobilinuria also occurs.