Abdominal Pain in Infants and Children: Diagnostic Approach and Management

Age-Specific Etiologies

Intussusception is the leading surgical cause in young infants, typically presenting with intermittent colicky pain, vomiting, and potentially bloody stools, according to the American Academy of Pediatrics 1
Gastroesophageal reflux disease (GERD) peaks at 4 months of age, affecting approximately 50% of infants, and presents with regurgitation, irritability, feeding refusal, poor weight gain, and back arching during feeds, as recommended by the American Academy of Family Physicians 2, 3
Appendicitis becomes more frequent in children 2-5 years old but presents atypically, with significantly higher rates of perforation due to delayed diagnosis, as noted by the American College of Surgeons 1
Urinary tract infections may present primarily as abdominal pain without classic urinary symptoms in children, according to the American Academy of Pediatrics 1
Eosinophilic esophagitis may present with feeding difficulties or failure to thrive with vomiting in children under 5 years, and with abdominal pain as the primary symptom in older children, as reported by the North American Society for Pediatric Gastroenterology 4, 5

Pain relief should be provided immediately and never withheld while awaiting diagnosis, as recommended by the American Academy of Pediatrics 6
For mild-moderate pain, oral NSAIDs can be used if there are no contraindications, according to the American College of Emergency Physicians 6
For severe pain, intravenous opioid analgesics titrated to effect can be used, as recommended by the American Society of Anesthesiologists 6
Red flags requiring immediate intervention include gastrointestinal bleeding, consistently forceful vomiting, fever with lethargy, abdominal tenderness or distension, and severe or persistent pain despite treatment, as noted by the American Academy of Pediatrics 2, 3, 6

A focused history and physical examination are sufficient to diagnose uncomplicated conditions in most infants without requiring diagnostic testing, according to the American Academy of Pediatrics 2, 3
Ultrasound is the initial imaging modality of choice in all pediatric age groups because it provides no radiation exposure and has excellent accuracy when definitive, as recommended by the American College of Radiology 1
Urinalysis is essential in all age groups to exclude urinary tract infection, which frequently mimics surgical emergencies, according to the American Academy of Pediatrics 1

Routine broad-spectrum antibiotics are not indicated for all infants with fever and abdominal pain when there is low suspicion of complicated infection, as recommended by the American Academy of Pediatrics 6
Antibiotics should be reserved for confirmed complicated intra-abdominal infections or high-risk scenarios, according to the Infectious Diseases Society of America 6