Hello! Thank you for the query. Upper abdominal pain radiating to the back is usually caused by gallstones. It usually appears after a fatty foods. Nausea and vomiting can also appear. The main problem with gallstones is that if they migrate to the bile ducts or pancreas ducts, jaundice or even acute pancreatitis can be appear. One of the jaundice symptoms is whole body itching. It does not have to be in the close to pain areas. Stool usually gets pale or white, urine becomes darker. If you find this symptoms similar to yours, you should visit your doctor and have it diagnosed. Abdominal ultrasound, blood work, liver tests should be done. Hope this will help. Regards.