- Abdominal pain
- Abdominal pain, generalized
- Abdominal pain, left lower quadrant
- Abdominal pain, left upper quadrant
- Abdominal pain, right lower quadrant
- Abdominal pain, right upper quadrant
- Abdominal pain, upper or epigastric
- Abscess, liver
- Acanthosis nigricans
- Acidosis, lactic
- Acidosis, metabolic, increased anion gap
- Acidosis, metabolic, normal anion gap
- Acidosis, renal tubular
- Acidosis, respiratory
- Adrenal mass
- Aggressive behavior
- Agoraphobia
- AIDS and altered mental status
- AIDS and brain mass
- AIDS and diarrhea
- AIDS and fever
- AIDS and FUO
- AIDS and oral lesions
- AIDS and pulmonary infiltrates
- AIDS and seizure
- Airway obstruction, bronchi
- Airway obstruction, trachea
- Airway obstruction, upper
- Alkaline phosphatase increased
- Alkalosis, metabolic
- Alkalosis, respiratory
- Allergic rhinitis
- Alopecia
- ALT/AST increased
- Altered mental status
- Altered mental status in a diabetic
- Altered mental status in HIV/AIDS
- Amaurosis fugax
- Amenorrhea, primary
- Amenorrhea, secondary
- Amylase increased
- Anal fissure
- Anaphylaxis
- Anemia, general approach
- Anemia, hemolytic
- Anemia, macrocytic
- Anemia, microcytic
- Anemia, normocytic
- Angioedema
- Angular cheilitis
- Anion gap, decreased
- Anion gap, increased
- Ankle pain
- Annular rash
- Anogenital pruritus
- Anorectal pain
- Anorexia
- Anosmia
- Anovulation in reproductive years
- Anxiety
- Appetite, poor
- Areolar lesions
- Arm ischemia
- Arthritis, acute, multijoint
- Arthritis, acute, one joint
- Arthritis, chronic, multijoint
- Arthritis, chronic, one joint
- Arthritis, general DDx
- Arthritis, migratory
- Arthritis and skin nodules
- Ascites, chylous
- Ascites, common causes
- Ascites, expanded list
- Ascites, malignant
- Aspiration of gastric contents, chronic
- AST/ALT increased
- Ataxia
- Atrial enlargement, left, EKG
- Atrial enlargement, right, EKG
- Auricle diseases
- Avascular necrosis
- AVN
- Axis deviation, left, EKG
- Axis deviation, right, EKG
Diagnosaurus 2.0