These pouches may be present without any symptoms, and are not contagious or cancerous. Diverticulits is the inflammation of the pouches.
Recent evidence suggests an association with low fiber diet.
Mild cramping or tenderness in the left side of the abdomen that is relieved by passing gas or moving bowels. Occasional bright red blood in the stool. Non-infected diverticula sometimes bleed. Intermittent cramping, abdominal pain that becomes constant. Pain may be disabling from the onset, or may not become disabling for several days.