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