Acute diverticulitis in the young is increasingly common and is not co
nfined to a particular ethnic or socioeconomic group. The majority of
cases are in men and occur in the fourth decade of life. Obesity is th
e major comorbid condition. The disease appears to be an early manifes
tation of that seen in the elderly based on identical anatomy and hist
ology. The high incidence of surgical intervention and the high incide
nce of emergent or urgent intervention, particularly following the ini
tial attack, suggests that this manifestation is a more virulent form
of the disease. Because of this, any patient under age 40 should under
go resection following the first documented attack of acute diverticul
itis.