Injury caused by infections, chemical toxins, or parasites

Leakage from damaged spleen, liver, or umbilical organs (patent urachus)

Leakage of material from damaged intestines (colic, enteritis, colitis)

Post-surgical complications (trauma, failure of sutures, foreign bodies)

Rupture of abdominal bacterial abscess (infection by Rhodococcus, Streptococcus, etc)

Rupture of the intestines, stomach, bladder, or rectum

Traumatic perforation or injury to the abdomen