Birth to one year	Two to five years	Six to 11 years	12 to 18 years
Infantile colic Gastroenteritis Constipation Urinary tract infection Intussusception Volvulus Incarcerated hernia Hirschsprung's disease	Gastroenteritis Appendicitis Constipation Urinary tract infection Intussusception Volvulus Trauma Pharyngitis Sickle cell crisis Henoch-Schönlein purpura Mesenteric lymphadenitis	Gastroenteritis Appendicitis Constipation Functional pain Urinary tract infection Trauma Pharyngitis Pneumonia Sickle cell crisis Henoch-Schönlein purpura Mesenteric lymphadenitis	Appendicitis Gastroenteritis Constipation Dysmenorrhea Mittelschmerz Pelvic inflammatory disease Threatened abortion Ectopic pregnancy Ovarian/testicular torsion