1. The incubation period of hepatitis A is about 30 days on average. The incubation period of hepatitis A is about 30 days on average. 2, often accompanied by nausea, vomiting, aversion to oily food and other similar gastritis performance. 3, followed by dark red urine like overnight tea, yellowing of skin and mucous membranes, and pale stool color. 4.Serum bilirubin and glutathione aminotransferase (SALT) are significantly increased in laboratory tests. 5.The disease is often self-limiting and the prognosis is good. Most of the cases (more than 80%) disappear within 3 months and the liver function returns to normal. Within 6 months, the disease is completely cured. No tendency to turn into chronic hepatitis, no chronic carriers of hepatitis A virus. 7, Very rarely heavy hepatitis. 8.If asymptomatic HBsAg carriers overlap hepatitis A infection, the clinical manifestations and course of the disease are similar to those of hepatitis A alone. However, the underlying disease is chronic hepatitis B or cirrhosis may aggravate the disease. 9. Hepatitis A is generally not severe due to pregnancy, and there is no worry of mother-to-child transmission and no chronic effect on the fetus.