Blood and urine amylase are mainly secreted by the pancreas, and elevated amylase is common in diseases such as pancreatitis. Since urinary amylase elevation is later than blood amylase elevation, and the elevation lasts for a long time, therefore, blood amylase is normal, and urinary amylase is two times higher than normal, which is common in the recovery stage of acute pancreatitis and chronic pancreatitis. After the occurrence of acute pancreatitis, blood amylase is often elevated in 2-12 hours after the onset of the disease and lasts for 3-5 days. While urinary amylase is often elevated at 12 to 24 hours after the onset of the disease and lasts for 3 to 10 days. Therefore, during the recovery period of pancreatitis, it is possible to have normal blood amylase and twice as high urine amylase. In addition, chronic pancreatitis can also present with normal blood amylase and 2-fold high urine amylase. In the case of abnormal amylase, it is recommended to consult a doctor for diagnosis and treatment in conjunction with symptoms and signs.