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Diverticulitis occurs when one or more of the pouches becomes infected from bacteria in the digestive tract. A mild infection can produce bloating, gas, and nausea, and most people donât immediately see a doctor for these symptoms, especially if they improve.
Abdominal Pain. One symptom of a flare-up of diverticulitis is abdominal pain. The patient may feel sudden pain in the lower left part of the abdomen, according to MayoClinic.com. In some cases, the pain may start out as a mild one and then gradually increase over several days.nother symptom of a diverticulitis flare-up includes nausea and vomiting, according to the Cleveland Clinic. Severe nausea and vomiting with abdominal distension may suggest a more significant complication of diverticulitis, such as a bowel obstruction.