Signs and symptoms of peritonitis include: Abdominal pain or tenderness Bloating or a feeling of fullness in your abdomen Fever Nausea and vomiting Loss of appetite Diarrhea Low urine output Thirst Inability to pass stool or gas Fatigue Confusion If you're receiving peritoneal dialysis, peritonitis symptoms may also include: Cloudy dialysis fluid White flecks, strands or clumps (fibrin) in the dialysis fluid