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