Abdominal swelling after total gastrectomy?

Depends. It depends how long after gastrectomy. If the swelling happens a few days later, it can be due to infection or bleeding. If it's just mild swelling, sometime it is just due to bloated intestines. If the gastrectomy was several weeks or months ago, the considerations include ascites (abdominal fluid), a hernia, versus tumor regrowth. Talk with your surgeon to learn more.