<unk>  (see workup by location)
May be associated with nausea, vomiting or diarrhea
Fever may be present in<unk>  from infectious etiology
Abdominal pain
Abdominal aortic aneurysm
Nausea and vomiting 
Aortocaval fistula
Nausea and vomiting
Acute gastroenteritis
Diffuse abdominal pain
Aortoenteric fisulta