Emergent
Necrotizing Enterocolitis<unk> Testicular torsion
Inguinal hernia
Incarcerated hernia
Trauma
Pyloric stenosis
Toxic megacolon
Hirschsprung's Disease
Nonemergent
Constipation
Acute Gastroenteritis
Colic
Necrotizing Enterocolitis<unk> Testicular torsion
Inguinal hernia
Incarcerated hernia
Trauma
Pyloric stenosis
Toxic megacolon
Hirschsprung's Disease
Incarcerated hernia
Constipation
Acute Gastroenteritis
Colic
Emergent
Intussusception
Testicular Torsion
Trauma<unk> Appendicitis
Toxic megacolon
Vaso-occlusive crisis
Nonemergent
Acute Gastroenteritis
Constipation
Urinary tract infection
Henoch-Schonlein purpura
Intussusception
Testicular Torsion
Trauma<unk> Appendicitis
Toxic megacolon
Vaso-occlusive crisis
Acute Gastroenteritis
Constipation
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
Constipation
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)
Constipation
Acute Gastroenteritis
Nonspecific viral syndrome
Streptococcus pharyngitis
Urinary tract infection
Pneumonia
Renal Stone
Henoch-Schonlein purpura
Inflammatory bowel disease
Vulvovaginitis
Behavioral-related
Lack of exercise
Diet-related
Fecal impaction
Stercoral colitis
Diverticulitis
Bowel obstruction
Small bowel obstruction
Large bowel obstruction
Ogilvie's syndrome
Malignant bowel obstruction
Specific causes: tumor, stricture, hernia, adhesion,<unk> Painful anorectal disorders (e.g. anal fissure, hemorrhoids)
Medical causes
Hypothyroidism 
Electrolytes
Hypomagnesia
Hypercalcemia
Hypokalemia
Medication-related
Opiods, antipsychotics, anticholinergics, antacid, antihistamines
Constipation (peds)
Lack of exercise
Diet-related
Small bowel obstruction
Large bowel obstruction
Ogilvie's syndrome
Malignant bowel obstruction
Specific causes: tumor, stricture, hernia, adhesion,<unk> Ogilvie's syndrome
Hypothyroidism 
Electrolytes
Hypomagnesia
Hypercalcemia
Hypokalemia
Hypomagnesia
Hypercalcemia
Opiods, antipsychotics, anticholinergics, antacid, antihistamines
Volvulus 
Emergent
Rectal foreign body
Necrotizing Enterocolitis
Anal fissure
Volvulus
Fecal impaction
Testicular torsion