No Anorexia: Appendicitis questionable.
Vomiting before Pain: Appendicitis questionable.
Pregnancy: Symptoms unreliable.
Differential Diagnosis of Acute Appendicitis
Gastrointestinal
Abdominal pain, cause unknown
Cholecystitis
Crohn’s disease
Diverticulitis
Duodenal ulcer
Gastroenteritis
Intestinal obstruction
Intussusception
Meckel’s diverticulitis
Mesenteric lymphadenitis
Necrotizing enterocolitis
Neoplasm (carcinoid, carcinoma, lymphoma)
Omental torsion
Pancreatitis
Perforated viscus
Volvulus
Gynecologic
Ectopic pregnancy
Endometriosis
Ovarian torsion
Pelvic inflammatory disease
Ruptured ovarian cyst (follicular, corpus luteum)
Tubo-ovarian abscess
Systemic
Diabetic ketoacidosis
Porphyria
Sickle cell disease
Henoch-Schönlein purpura
Pulmonary
Pleuritis
Pneumonia (basilar)
Pulmonary infarction
Genitourinary
Kidney stone
Prostatitis
Pyelonephritis
Testicular torsion
Urinary tract infection
Wilms’ tumor
Other
Parasitic infection
Psoas abscess
Rectus sheath hematoma