1. A fib, also known asAtrial fibrillation)
  2. Abdominal aortic aneurysm
  3. Abnormally excessive sweating, also known asHyperhidrosis)
  4. Abscess, Bartholin's, also known asBartholin's cyst)
  5. Absence seizure
  6. Acanthosis nigricans
  7. Achalasia
  8. Achilles tendinitis
  9. Achilles tendon rupture
  10. Acid reflux, also known asGastroesophageal reflux disease (GERD))
  11. Acid reflux, infant, also known asInfant reflux)
  12. ACL injury
  13. Acne
  14. Acoustic neuroma
  15. Acquired immunodeficiency syndrome, also known asHIV/AIDS)
  16. Acromegaly
  17. Actinic keratosis
  18. Acute coronary syndrome
  19. Acute febrile neutrophilic dermatosis, also known asSweet's syndrome)
  20. Acute flaccid myelitis (AFM)
  21. Acute granulocytic leukemia, also known asAcute myelogenous leukemia)
  22. Acute inflammatory demyelinating polyneuropathy, also known asGuillain-Barre syndrome)
  23. Acute kidney failure
  24. Acute liver failure
  25. Acute lymphoblastic leukemia, also known asAcute lymphocytic leukemia)
  26. Acute lymphocytic leukemia
  27. Acute lymphoid leukemia, also known asAcute lymphocytic leukemia)
  28. Acute myeloblastic leukemia, also known asAcute myelogenous leukemia)
  29. Acute myelogenous leukemia
  30. Acute myeloid lukemia, also known asAcute myelogenous leukemia)
  31. Acute nonlymphocytic leukemia, also known asAcute myelogenous leukemia)
  32. Acute radiation sickness, also known asRadiation sickness)
  33. Acute radiation syndrome, also known asRadiation sickness)
  34. Acute renal failure, also known asAcute kidney failure)
  35. Acute respiratory distress syndrome, also known asARDS)
  36. Acute sinusitis
  37. Addiction, alcohol, also known asAlcohol use disorder)
  38. Addiction, drug, also known asDrug addiction (substance use disorder))
  39. Addiction, gambling, also known asCompulsive gambling)
  40. Addiction, nicotine, also known asNicotine dependence)
  41. Addison's disease
  42. Adenitis, mesenteric, also known asMesenteric lymphadenitis)
  43. Adenomyosis
  44. ADHD in children, also known asAttention-deficit/hyperactivity disorder (ADHD) in children)
  45. ADHD, Adult, also known asAdult attention-deficit/hyperactivity disorder (ADHD))
  46. Adhesive capsulitis, also known asFrozen shoulder)
  47. Adjustment disorders
  48. Adnexal tumors
  49. Adolescent schizophrenia, also known asChildhood schizophrenia)
  50. Adrenal cancer
  51. Adrenal gland tumor, also known asPheochromocytoma)
  52. Adrenal mass, also known asBenign adrenal tumors)
  53. Adrenoleukodystrophy
  54. Adult attention-deficit/hyperactivity disorder (ADHD)
  55. Adult Still's disease
  56. AFM, also known asAcute flaccid myelitis (AFM))
  57. Age spots (liver spots)
  58. Age-related macular degeneration, dry, also known asDry macular degeneration)
  59. Age-related macular degeneration, wet, also known asWet macular degeneration)
  60. Agnogenic myeloid metaplasia, also known asMyelofibrosis)
  61. Agoraphobia
  62. AIDP, also known asGuillain-Barre syndrome)
  63. AIDS/HIV, also known asHIV/AIDS)
  64. Airplane ear
  65. Albinism
  66. Alcohol addiction, also known asAlcohol use disorder)
  67. Alcohol intolerance
  68. Alcohol poisoning
  69. Alcohol use disorder
  70. Alcoholic hepatitis
  71. Allergic granulomatosis, also known asChurg-Strauss syndrome)
  72. Allergic granulomatosis and angiitis, also known asChurg-Strauss syndrome)
  73. Allergic rhinitis, also known asHay fever)
  74. Allergies
  75. Allergy, dust mite, also known asDust mite allergy)
  76. Allergy, egg, also known asEgg allergy)
  77. Allergy, food, also known asFood allergy)
  78. Allergy, latex, also known asLatex allergy)
  79. Allergy, milk, also known asMilk allergy)
  80. Allergy, mold, also known asMold allergy)
  81. Allergy, nickel, also known asNickel allergy)
  82. Allergy, peanut, also known asPeanut allergy)
  83. Allergy, penicillin, also known asPenicillin allergy)
  84. Allergy, pet, also known asPet allergy)
  85. Allergy, shellfish, also known asShellfish allergy)
  86. Allergy, soy, also known asSoy allergy)
  87. Allergy, wheat, also known asWheat allergy)
  88. Alopecia, also known asHair loss)
  89. Alpha-gal syndrome
  90. ALS, also known asAmyotrophic lateral sclerosis (ALS))
  91. Alveolar osteitis, also known asDry socket)
  92. Alzheimer's disease
  93. Ambiguous genitalia
  94. Amblyopia, also known asLazy eye (amblyopia))
  95. Ameloblastoma
  96. Amenorrhea
  97. American trypanosomiasis, also known asChagas disease)
  98. Amnesia
  99. Amnesia, transient global, also known asTransient global amnesia)
  100. Amnestic syndrome, also known asAmnesia)
  101. Amniotic fluid embolism
  102. Ampullary cancer
  103. Amyloid disease, also known asAmyloidosis)
  104. Amyloidosis
  105. Amyotrophic lateral sclerosis (ALS)
  106. Anal cancer
  107. Anal fissure
  108. Anal fistula
  109. Anal itching
  110. Anaphylaxis
  111. Anemia
  112. Anemia, aplastic, also known asAplastic anemia)
  113. Anemia, Cooley's, also known asThalassemia)
  114. Anemia, iron deficiency, also known asIron deficiency anemia)
  115. Anemia, Mediterranean, also known asThalassemia)
  116. Anemia, sickle cell, also known asSickle cell anemia)
  117. Anemia, vitamin deficiency, also known asVitamin deficiency anemia)
  118. Aneurysm, abdominal aortic, also known asAbdominal aortic aneurysm)
  119. Aneurysm, aortic, also known asAortic aneurysm)
  120. Aneurysm, brain, also known asBrain aneurysm)
  121. Aneurysm, cerebral, also known asBrain aneurysm)
  122. Aneurysm, popliteal, also known asPopliteal artery aneurysm)
  123. Aneurysm, thoracic aortic, also known asThoracic aortic aneurysm)
  124. Aneurysms
  125. Angelman syndrome
  126. Angiitis, also known asVasculitis)
  127. Angina
  128. Angina pectoris, also known asAngina)
  129. Angioedema and hives, also known asHives and angioedema)
  130. Angiofollicular lymph node hyperplasia, also known asCastleman disease)
  131. Angiosarcoma
  132. Anhidrosis
  133. Ankle fracture, also known asBroken ankle)
  134. Ankle sprain, also known asSprained ankle)
  135. Ankyloglossia, also known asTongue-tie (ankyloglossia))
  136. Ankylosing spondylitis
  137. Anorexia, also known asAnorexia nervosa)
  138. Anorexia nervosa
  139. Anorgasmia in women
  140. Anterior cruciate ligament injury, also known asACL injury)
  141. Anterior prolapse (cystocele)
  142. Anterior vaginal prolapse, also known asAnterior prolapse (cystocele))
  143. Anthrax
  144. Antibiotic-associated colitis, also known asPseudomembranous colitis)
  145. Antibiotic-associated diarrhea
  146. Antiphospholipid syndrome
  147. Antisocial personality disorder
  148. Anxiety disorder, generalized, also known asGeneralized anxiety disorder)
  149. Anxiety disorder, social, also known asSocial anxiety disorder (social phobia))
  150. Anxiety disorders
  151. Aortic aneurysm
  152. Aortic aneurysm, abdominal, also known asAbdominal aortic aneurysm)
  153. Aortic coarctation, also known asCoarctation of the aorta)
  154. Aortic dissection
  155. Aortic valve disease
  156. Aortic valve regurgitation
  157. Aortic valve stenosis
  158. Aphasia
  159. Aphasia, primary progressive, also known asPrimary progressive aphasia)
  160. Aphthous stomatitis, also known asCanker sore)
  161. Aphthous ulcer, also known asCanker sore)
  162. Apical ballooning syndrome, also known asBroken heart syndrome)
  163. Aplastic anemia
  164. Appendicitis
  165. ARDS
  166. Arenaviruses, also known asViral hemorrhagic fevers)
  167. Argentine hemorrhagic fever, also known asViral hemorrhagic fevers)
  168. Arm fracture, also known asBroken arm)
  169. Arnold-Chiari malformation, also known asChiari malformation)
  170. Arrhythmia, also known asHeart arrhythmia)
  171. Arteriosclerosis / atherosclerosis
  172. Arteriovenous fistula
  173. Arteriovenous malformation
  174. Arteritis, giant cell, also known asGiant cell arteritis)
  175. Arteritis, Takayasu's, also known asTakayasu's arteritis)
  176. Arthritis
  177. Arthritis, basal joint, also known asThumb arthritis)
  178. Arthritis, degenerative, also known asOsteoarthritis)
  179. Arthritis, gouty, also known asGout)
  180. Arthritis, infectious, also known asSeptic arthritis)
  181. Arthritis, juvenile idiopathic, also known asJuvenile idiopathic arthritis)
  182. Arthritis, osteoarthritis, also known asOsteoarthritis)
  183. Arthritis, psoriatic, also known asPsoriatic arthritis)
  184. Arthritis, reactive, also known asReactive arthritis)
  185. Arthritis, rheumatoid, also known asRheumatoid arthritis)
  186. Arthritis, septic, also known asSeptic arthritis)
  187. Arthritis, thumb, also known asThumb arthritis)
  188. Asbestosis
  189. Ascariasis
  190. ASD, also known asAtrial septal defect (ASD))
  191. Aseptic necrosis, also known asAvascular necrosis)
  192. Aspergillosis
  193. Asthma
  194. Asthma attack
  195. Asthma, childhood, also known asChildhood asthma)
  196. Asthma, exercise-induced, also known asExercise-induced asthma)
  197. Asthma, occupational, also known asOccupational asthma)
  198. Astigmatism
  199. Astrocytoma
  200. AT, also known asAtrial tachycardia)
  201. Ataxia
  202. Atelectasis
  203. Atherosclerosis, also known asArteriosclerosis / atherosclerosis)
  204. Athlete's foot
  205. Atopic dermatitis (eczema)
  206. Atrial fibrillation
  207. Atrial flutter
  208. Atrial septal defect (ASD)
  209. Atrial tachycardia
  210. Atrioventricular canal defect
  211. Atrioventricular nodal reentry tachycardia (AVNRT)
  212. Atrioventricular septal defect, also known asAtrioventricular canal defect)
  213. Atrophic vaginitis, also known asVaginal atrophy)
  214. Attachment disorder, also known asReactive attachment disorder)
  215. Attention-deficit/hyperactivity disorder (ADHD) in children
  216. Attention-deficit/hyperactivity disorder in adults, also known asAdult attention-deficit/hyperactivity disorder (ADHD))
  217. Atypical depression
  218. Atypical hyperplasia of the breast
  219. Autism spectrum disorder
  220. Autoimmune hepatitis
  221. Autoimmune pancreatitis
  222. Autonomic neuropathy
  223. Avascular necrosis
  224. Avian influenza, also known asBird flu (avian influenza))
  225. AVN, also known asAvascular necrosis)
  226. AVNRT, also known asAtrioventricular nodal reentry tachycardia (AVNRT))
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