Choledochal cyst type 1 is a more serious disease. This is because choledochal cyst type 1 has the risk of becoming cancerous and producing cholangiocarcinoma. At the same time, as the choledochal cyst increases in size, it will exert pressure on the surrounding tissues and organs, causing obstruction of the choledochal duct, leading to complications such as cholangitis and choledocholithiasis, which can be life-threatening in severe cases. Therefore, choledochal cysts need to be removed surgically. Choledochal cyst is due to abnormal development of bile duct, which is a congenital disease, usually patients do not have special clinical symptoms, found by chance in the physical examination of the abdominal ultrasound or abdominal CT, with the choledochal cyst volume becomes bigger, it will cause the patient’s choledochal stone or even cholangitis, patients may have abdominal pain and distension, nausea and vomiting, loss of appetite, yellow muscle thin, and even shock. Once diagnosed, patients with choledochal cysts are recommended to have them surgically removed. If you feel unwell, go to the hospital in time, do not be careless, so as not to delay the treatment.