A pancreatic pseudocyst is the most common cystic lesion in the pancreas. There are several treatment methods with variable results. Recently, conservative treatment has been preferred because it has fewer complications. In this case, a 37-year-old male patient had pancreatic pseudocysts with upper abdominal pain, left upper back pain, diarrhea, weight loss, and general weakness. We prescribed him Banchongsangamibang (蟠蔥散加味方). For about 1 year, he was treated with oriental medicine. All of his pancreatic pseudocysts disappeared on abdominal CT follow-up and the symptoms mostly subsided. There had been no recurrence of pancreatic pseudocysts on abdominal CT follow-up after 1 year.