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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.
The signs and symptoms of diverticulitis include: 1  Pain, which may be constant and persist for several days. Pain is usually felt in the lower left side of the abdomen, but may occur on the right, especially in people of Asian descent.  Nausea and vomiting.