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  1. Abdominal aortic aneurysm
  2. Abscess, Bartholin's (See: Bartholin's cyst)
  3. Absence seizure
  4. Acanthosis nigricans
  5. Achalasia
  6. Achilles tendinitis
  7. Achilles tendon rupture
  8. Acid reflux (See: GERD)
  9. Acid reflux, infant (See: Infant reflux)
  10. ACL injury
  11. Acne
  12. Acoustic neuroma
  13. Acquired immunodeficiency syndrome (See: HIV/AIDS)
  14. Acromegaly
  15. Actinic keratosis
  16. Acute coronary syndrome
  17. Acute febrile neutrophilic dermatosis (See: Sweet's syndrome)
  18. Acute inflammatory demyelinating polyneuropathy (See: Guillain-Barre syndrome)
  19. Acute kidney failure
  20. Acute kidney injury (See: Acute kidney failure)
  21. Acute liver failure
  22. Acute lymphocytic leukemia
  23. Acute lyphoblastic leukemia (See: Acute lymphocytic leukemia)
  24. Acute lyphoid leukemia (See: Acute lymphocytic leukemia)
  25. Acute myelogenous leukemia (AML)
  26. Acute radiation sickness (See: Radiation sickness)
  27. Acute radiation syndrome (See: Radiation sickness)
  28. Acute respiratory distress syndrome (See: ARDS)
  29. Acute sinusitis
  30. Addiction, alcohol (See: Alcohol use disorder)
  31. Addiction, drug (See: Drug addiction)
  32. Addiction, gambling (See: Compulsive gambling)
  33. Addiction, nicotine (See: Nicotine dependence)
  34. Addiction, tobacco (See: Nicotine dependence)
  35. Addison's disease
  36. Adenitis, mesenteric (See: Mesenteric lymphadenitis)
  37. Adenomyosis
  38. ADHD in children (See: Attention-deficit/hyperactivity disorder (ADHD) in children)
  39. ADHD, Adult (See: Adult attention-deficit/hyperactivity disorder (ADHD))
  40. Adhesive capsulitis (See: Frozen shoulder)
  41. Adjustment disorders
  42. Adnexal tumors
  43. Adolescent schizophrenia (See: Childhood schizophrenia)
  44. Adrenal cancer
  45. Adrenal gland tumor (See: Pheochromocytoma)
  46. Adrenal insufficiency (See: Addison's disease)
  47. Adrenal mass (See: Benign adrenal tumors)
  48. Adrenoleukodystrophy
  49. Adult attention-deficit/hyperactivity disorder (ADHD)
  50. Adult Still's disease
  51. Age spots (liver spots)
  52. Age-related macular degeneration, dry (See: Macular degeneration, dry)
  53. Age-related macular degeneration, wet (See: Macular degeneration, wet)
  54. Agnogenic myeloid metaplasia (See: Myelofibrosis)
  55. Agoraphobia
  56. AIDP (See: Guillain-Barre syndrome)
  57. AIDS/HIV (See: HIV/AIDS)
  58. Airplane ear
  59. Albinism
  60. Alcohol addiction (See: Alcohol use disorder)
  61. Alcohol intolerance
  62. Alcohol poisoning
  63. Alcohol use disorder
  64. Alcoholic hepatitis
  65. Alcohol-related birth defects (See: Fetal alcohol syndrome)
  66. Alcohol-related neurodevelopmental disorder (See: Fetal alcohol syndrome)
  67. Aldosteronoma (See: Primary aldosteronism)
  68. Allergic angiitis (See: Churg-strauss syndrome)
  69. Allergic granulomatosis (See: Churg-strauss syndrome)
  70. Allergic reaction (See: Allergies)
  71. Allergic rhinitis (See: Hay fever)
  72. Allergies
  73. Allergy, dust mite (See: Dust mite allergy)
  74. Allergy, egg (See: Egg allergy)
  75. Allergy, food (See: Food allergy)
  76. Allergy, latex (See: Latex allergy)
  77. Allergy, milk (See: Milk allergy)
  78. Allergy, mold (See: Mold allergy)
  79. Allergy, nickel (See: Nickel allergy)
  80. Allergy, peanut (See: Peanut allergy)
  81. Allergy, penicillin (See: Penicillin allergy)
  82. Allergy, pet (See: Pet allergy)
  83. Allergy, shellfish (See: Shellfish allergy)
  84. Allergy, soy (See: Soy allergy)
  85. Allergy, wheat (See: Wheat allergy)
  86. Alopecia (See: Hair loss)
  87. ALS (See: Amyotrophic lateral sclerosis)
  88. Alveolar osteitis (See: Dry socket)
  89. Alzheimer's disease
  90. Ambiguous genitalia
  91. Amblyopia (See: Lazy eye (amblyopia))
  92. Ameloblastoma
  93. Amenorrhea
  94. American trypanosomiasis (See: Chagas disease)
  95. Amnesia
  96. Amnesia, dissociative (See: Dissociative disorders)
  97. Amnesia, transient global (See: Transient global amnesia)
  98. Amnestic syndrome (See: Amnesia)
  99. Amniotic fluid embolism
  100. Ampullary cancer
  101. Amyloidosis
  102. Amyotrophic lateral sclerosis
  103. Anal cancer
  104. Anal fissure
  105. Anal fistula
  106. Anal itching
  107. Anaphylaxis
  108. Anaplasmosis (See: Ehrlichiosis)
  109. Anemia
  110. Anemia, aplastic (See: Aplastic anemia)
  111. Anemia, Cooley's (See: Thalassemia)
  112. Anemia, iron deficiency (See: Iron deficiency anemia)
  113. Anemia, Mediterranean (See: Thalassemia)
  114. Anemia, sickle cell (See: Sickle cell anemia)
  115. Anemia, vitamin deficiency (See: Vitamin deficiency anemia)
  116. Aneurysm, abdominal aortic (See: Abdominal aortic aneurysm)
  117. Aneurysm, brain (See: Brain aneurysm)
  118. Aneurysm, cerebral (See: Brain aneurysm)
  119. Aneurysms
  120. Angelman syndrome
  121. Angiitis (See: Vasculitis)
  122. Angiitis, allergic (See: Churg-strauss syndrome)
  123. Angina
  124. Angina pectoris (See: Angina)
  125. Angioedema and hives (See: Hives and angioedema)
  126. Angiofollicular lymph node hyperplasia (See: Castleman disease)
  127. Anhidrosis
  128. Ankle fracture (See: Broken ankle/broken foot)
  129. Ankle sprain (See: Sprained ankle)
  130. Ankyloglossia (See: Tongue-tie (ankyloglossia))
  131. Ankylosing spondylitis
  132. Anorexia (See: Anorexia nervosa)
  133. Anorexia nervosa
  134. Anorgasmia
  135. Anterior cruciate ligament injury (See: ACL injury)
  136. Anterior prolapse (cystocele)
  137. Anthrax
  138. Antibiotic-associated colitis (See: Pseudomembranous colitis)
  139. Antibiotic-associated diarrhea
  140. Antiphospholipid syndrome
  141. Antisocial personality disorder
  142. Anxiety
  143. Anxiety disorder, generalized (See: Generalized anxiety disorder)
  144. Anxiety disorder, social (See: Social anxiety disorder)
  145. Aortic aneurysm
  146. Aortic coarctation (See: Coarctation of the aorta)
  147. Aortic dissection
  148. Aortic valve disease
  149. Aortic valve regurgitation
  150. Aortic valve stenosis
  151. Aphasia
  152. Aphasia, primary progressive (See: Primary progressive aphasia)
  153. Aphthous ulcer (See: Canker sore)
  154. Apical ballooning syndrome (See: Broken heart syndrome)
  155. Aplastic anemia
  156. Apnea, sleep (See: Sleep apnea)
  157. Apnea, sleep (central) (See: Sleep apnea, central)
  158. Apnea, sleep (obstructive) (See: Sleep apnea, obstructive)
  159. Appendicitis
  160. ARDS
  161. Arenaviruses (See: Viral hemorrhagic fevers)
  162. Argentine hemorrhagic fever (See: Viral hemorrhagic fevers)
  163. Arm fracture (See: Broken arm)
  164. Arrhythmia (See: Heart arrhythmias)
  165. Arteriosclerosis / atherosclerosis
  166. Arteriovenous fistula
  167. Arteriovenous malformation
  168. Arteritis, giant cell (See: Giant cell arteritis)
  169. Arteritis, Takayasu's (See: Takayasu's arteritis)
  170. Arthritis
  171. Arthritis, basal joint (See: Thumb arthritis)
  172. Arthritis, gouty (See: Gout)
  173. Arthritis, infectious (See: Septic arthritis)
  174. Arthritis, juvenile rheumatoid (See: Juvenile rheumatoid arthritis)
  175. Arthritis, osteoarthritis (See: Osteoarthritis)
  176. Arthritis, psoriatic (See: Psoriatic arthritis)
  177. Arthritis, reactive (See: Reactive arthritis)
  178. Arthritis, rheumatoid (See: Rheumatoid arthritis)
  179. Arthritis, septic (See: Septic arthritis)
  180. Arthritis, thumb (See: Thumb arthritis)
  181. Asbestosis
  182. Ascariasis
  183. ASD (See: Atrial septal defect)
  184. Aspergillosis
  185. Asthma
  186. Asthma attack
  187. Asthma, childhood (See: Childhood asthma)
  188. Asthma, exercise-induced (See: Exercise-induced asthma)
  189. Asthma, occupational (See: Occupational asthma)
  190. Astigmatism
  191. AT (See: Atrial tachycardia)
  192. Ataxia
  193. Atelectasis
  194. Atherosclerosis (See: Arteriosclerosis / atherosclerosis)
  195. Athlete’s foot
  196. Atopic dermatitis (eczema)
  197. Atrial fibrillation
  198. Atrial flutter
  199. Atrial septal defect
  200. Atrial tachycardia
  201. Atrioventricular canal defect
  202. Atrioventricular nodal reentry tachycardia (AVNRT)
  203. Atrioventricular septal defect (See: Atrioventricular canal defect)
  204. Atrophic vaginitis (See: Vaginal atrophy)
  205. Attachment disorder (See: Reactive attachment disorder)
  206. Attention-deficit/hyperactivity disorder (ADHD) in children
  207. Attention-deficit/hyperactivity disorder in adults (See: Adult attention-deficit/hyperactivity disorder (ADHD))
  208. Atypical depression
  209. Atypical hyperplasia of the breast
  210. Autism spectrum disorder
  211. Autoimmune hepatitis
  212. Autoimmune pancreatitis
  213. Autonomic neuropathy
  214. Avascular necrosis
  215. Avian influenza (See: Bird flu (avian influenza))
  216. AVNRT (See: Atrioventricular nodal reentry tachycardia (AVNRT))
  217. Avoidant personality disorder (See: Personality disorders)
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