What are symptoms of diverticulitis?

Abdominal pain : Diverticulitis, an infection or inflammation of small pouches in the lining of the bowel , especially the large intestine , causes fairly severe abdominal pain esp on the lower left side , fever, nausea ,blood in stool , constipation and occasional diarrhea .Complications include abscess, blockage of the bowel from scarring ,or a fistula , with another organ or peritonitis from a burst pouch