We present the case of a young mother, 21 years old, who developed an intra-abdominal abscess 2 weeks after the caesarean section. Postpartum abscess after caesarean section is rare (≤1%), but potentially a very serious complication. It usually occurs as a consequence of inadequate or delayed treatment of postesectional endometritis. Risk factors are younger age, lower socioeconomic status, multiple vaginal examinations and length of caesarean section. The causes are anaerobic and Gram-negative bacteria. Clinical symptoms are variable, nonspecific and present as fever, abdominal and pelvic pain, signs of peritonitis, tachycardia, tachypnea, and generalized weakness. Complications include septicemia, fistula formation, multiorgan dysfunction, and even death. Ultrasound examination is the initial diagnostic method that can confirm the existence of a purulent collection. In case of diagnostic dilemmas, an urgent CT examination is indicated.