<unk> Hirschsprung's disease
Congenital anorectal malformations
Imperforate anus
Bowel obstruction
Neurologic disorders
Encephalopathy
Spinal cord abnormalities: myelomeningocele, spina bifida, tethered cord
Meconium ileus
Cystic fibrosis
Metabolic causes
Hypothyroidism
Hypercalcemia
Hypokalemia
Diabetes insipidus
Heavy-metal poisoning 
Medication side effects
Imperforate anus
Cystic fibrosis
Hypothyroidism
Hypercalcemia
Hypokalemia
Diabetes insipidus
Functional<unk> (>95% of cases)
Organic causes
Hirschsprung's disease
Metabolic causes
Hypothyroidism
Hypercalcemia
Hypokalemia
Diabetes insipidus
Diabetes Mellitus
Cystic fibrosis
Gluten enteropathy
Spinal cord trauma or abnormalities
Neurofibromatosis
Heavy-metal poisoning
Medication side effects
Developmental delays
Sexual abuse
Hirschsprung's disease
Metabolic causes
Hypothyroidism
Hypercalcemia
Hypokalemia
Diabetes insipidus
Diabetes Mellitus
Cystic fibrosis
Gluten enteropathy
Spinal cord trauma or abnormalities
Neurofibromatosis
Heavy-metal poisoning
Medication side effects
Developmental delays
Sexual abuse
Hypothyroidism
Hypercalcemia
Hypokalemia
Diabetes insipidus
Diabetes Mellitus
Emergent
Necrotizing Enterocolitis
Volvulus
Testicular torsion
Inguinal hernia
Incarcerated hernia
Trauma
Pyloric stenosis
Toxic megacolon
Hirschsprung's Disease
Nonemergent<unk> Acute Gastroenteritis
Colic
Necrotizing Enterocolitis
Volvulus
Testicular torsion
Inguinal hernia
Incarcerated hernia
Trauma
Pyloric stenosis
Toxic megacolon
Hirschsprung's Disease
Incarcerated hernia<unk> Acute Gastroenteritis
Colic
Emergent
Intussusception
Testicular Torsion
Trauma
Volvulus
Appendicitis
Toxic megacolon
Vaso-occlusive crisis
Nonemergent
Acute Gastroenteritis<unk> Urinary tract infection
Henoch-Schonlein purpura
Intussusception
Testicular Torsion
Trauma
Volvulus
Appendicitis
Toxic megacolon
Vaso-occlusive crisis
Acute Gastroenteritis<unk> Urinary tract infection
Henoch-Schonlein purpura
Emergent
Appendicitis
DKA
Vaso-occlusive crisis
Toxic ingestion
Testicular Torsion
Ovarian Torsion
Ectopic Pregnancy
Trauma
Toxic megacolon
Inflammatory bowel disease
Gastric ulcer disease
Ovarian cyst
Pregnancy
Pancreatitis
Cholecystitis
Intussusception (to age 6)
Nonemergent<unk> Acute Gastroenteritis
Nonspecific viral syndrome
Streptococcus pharyngitis
Urinary tract infection
Pneumonia
Renal Stone
Henoch-Schonlein purpura
Inflammatory bowel disease
Vulvovaginitis
Appendicitis
DKA
Vaso-occlusive crisis
Toxic ingestion
Testicular Torsion
Ovarian Torsion
Ectopic Pregnancy
Trauma
Toxic megacolon
Inflammatory bowel disease
Gastric ulcer disease
Ovarian cyst
Pregnancy
Pancreatitis
Cholecystitis
Intussusception (to age 6)<unk> Acute Gastroenteritis
Nonspecific viral syndrome
Streptococcus pharyngitis
Urinary tract infection
Pneumonia
Renal Stone
Henoch-Schonlein purpura
Inflammatory bowel disease
Vulvovaginitis
Constipation 
Constipation
Dysuria
Hirschsprung's disease
Dysphagia
Congenital anorectal malformations
Hiccups
Imperforate anus