Abstract: This was a patient with a medical history of aspirin-aggravated respiratory disease present with eosinophilic enteritis and recurrent acute pancreatitis. Eosinophilic granulomatosis with polyangiitis was clinically suspected due to the clinical presentation of multiple systems involved and the histological appearance of eosinophilic infiltrate, while acute pancreatitis was rarely reported in this disease. In addition, the patient developed pancreatic pseudocyst, and delayed pseudoaneurysm hemorrhage occurred after drainage of the pseudocyst. The hemorrhage was successfully treated after angiographic embolization, and the patient remained stable after one year. Both the diagnosis and the management of this case were challenging and worth learning.