Chronic diarrhea is defined as diarrhea that lasts longer than four weeks. Etiology of chronic diarrhea includes inflammatory bowel disease, malabsorption syndromes, irritable bowel disease, chronic parasitic infections, bacterial toxins, drugs and motility disorders. Plastron appendicitis is an abscess formation that occurs when the appendix is surrounded by the omentum following perforation of acute appendicitis. The cases usually present with abdominal pain, nausea, vomiting, and abdominal mass. Chronic diarrhea is a rare finding. In this study, we explore a case of a 63-year-old man who had diarrhea and intermittent abdominal pain for 3 months and underwent a diagnosis of plastron appendicitis as a result of the investigations.