Patients are treated ambulatory with oral antibiotic for 10 days; for the first five days these patients are contacted by telephone daily to progress oral intake.

Patients are hospitalized and treated with antibiotic, for the first days by endovenous antibiotic and with diet progression orally.

Patients are treated with the same antibiotic agent, the difference between the two arms is endovenous treatment for hospitalized patients for the first days till oral feeding. The ambulatory group starts directly with orally administered antibiotic treatment.

Failure of the conservative treatment within 30 days after randomization which consists in one or more of the mentioned signs: persistent or increasing pain, treatment resistant fever, intestinal oclusion, necesity to drain a new intra-abdominal abscess, indication for surgery, mortality.

Recurrence of diverticulitis within 30 days; quality of life and patient satisfaction is asessed comparing management with and without admittance to the hospital and costs are calculated for the treatment in both regimens.