At its core, diverticular disease refers to conditions that involve small pouches, called diverticula, forming in the walls of the digestive tract. These pouches can remain harmless (a condition called diverticulosis) or become inflamed and infected, leading to a more serious condition known as diverticulitis. Both stages fall under the umbrella of diverticular disease, and the symptoms, treatment options, and management strategies can vary depending on your situation.