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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, transient global (See: Transient global amnesia)
  97. Amnestic syndrome (See: Amnesia)
  98. Amniotic fluid embolism
  99. Ampullary cancer
  100. Amyloidosis
  101. Amyotrophic lateral sclerosis
  102. Anal cancer
  103. Anal fissure
  104. Anal fistula
  105. Anal itching
  106. Anaphylaxis
  107. Anaplasmosis (See: Ehrlichiosis)
  108. Anemia
  109. Anemia, aplastic (See: Aplastic anemia)
  110. Anemia, Cooley's (See: Thalassemia)
  111. Anemia, iron deficiency (See: Iron deficiency anemia)
  112. Anemia, Mediterranean (See: Thalassemia)
  113. Anemia, sickle cell (See: Sickle cell anemia)
  114. Anemia, vitamin deficiency (See: Vitamin deficiency anemia)
  115. Aneurysm, abdominal aortic (See: Abdominal aortic aneurysm)
  116. Aneurysm, brain (See: Brain aneurysm)
  117. Aneurysm, cerebral (See: Brain aneurysm)
  118. Aneurysms
  119. Angelman syndrome
  120. Angiitis (See: Vasculitis)
  121. Angiitis, allergic (See: Churg-strauss syndrome)
  122. Angina
  123. Angina pectoris (See: Angina)
  124. Angioedema and hives (See: Hives and angioedema)
  125. Angiofollicular lymph node hyperplasia (See: Castleman disease)
  126. Anhidrosis
  127. Ankle fracture (See: Broken ankle/broken foot)
  128. Ankle sprain (See: Sprained ankle)
  129. Ankyloglossia (See: Tongue-tie (ankyloglossia))
  130. Ankylosing spondylitis
  131. Anorexia (See: Anorexia nervosa)
  132. Anorexia nervosa
  133. Anorgasmia
  134. Anterior cruciate ligament injury (See: ACL injury)
  135. Anterior prolapse (cystocele)
  136. Anthrax
  137. Antibiotic-associated colitis (See: Pseudomembranous colitis)
  138. Antibiotic-associated diarrhea
  139. Antiphospholipid syndrome
  140. Antisocial personality disorder
  141. Anxiety
  142. Anxiety disorder, generalized (See: Generalized anxiety disorder)
  143. Anxiety disorder, social (See: Social anxiety disorder)
  144. Aortic aneurysm
  145. Aortic coarctation (See: Coarctation of the aorta)
  146. Aortic dissection
  147. Aortic valve disease
  148. Aortic valve regurgitation
  149. Aortic valve stenosis
  150. Aphasia
  151. Aphasia, primary progressive (See: Primary progressive aphasia)
  152. Aphthous ulcer (See: Canker sore)
  153. Apical ballooning syndrome (See: Broken heart syndrome)
  154. Aplastic anemia
  155. Apnea, sleep (See: Sleep apnea)
  156. Apnea, sleep (central) (See: Sleep apnea, central)
  157. Apnea, sleep (obstructive) (See: Sleep apnea, obstructive)
  158. Appendicitis
  159. ARDS
  160. Arenaviruses (See: Viral hemorrhagic fevers)
  161. Argentine hemorrhagic fever (See: Viral hemorrhagic fevers)
  162. Arm fracture (See: Broken arm)
  163. Arrhythmia (See: Heart arrhythmias)
  164. Arteriosclerosis / atherosclerosis
  165. Arteriovenous fistula
  166. Arteriovenous malformation
  167. Arteritis, giant cell (See: Giant cell arteritis)
  168. Arteritis, Takayasu's (See: Takayasu's arteritis)
  169. Arthritis
  170. Arthritis, basal joint (See: Thumb arthritis)
  171. Arthritis, gouty (See: Gout)
  172. Arthritis, infectious (See: Septic arthritis)
  173. Arthritis, juvenile rheumatoid (See: Juvenile rheumatoid arthritis)
  174. Arthritis, osteoarthritis (See: Osteoarthritis)
  175. Arthritis, psoriatic (See: Psoriatic arthritis)
  176. Arthritis, reactive (See: Reactive arthritis)
  177. Arthritis, rheumatoid (See: Rheumatoid arthritis)
  178. Arthritis, septic (See: Septic arthritis)
  179. Arthritis, thumb (See: Thumb arthritis)
  180. Asbestosis
  181. Ascariasis
  182. ASD (See: Atrial septal defect)
  183. Aspergillosis
  184. Asthma
  185. Asthma attack
  186. Asthma, childhood (See: Childhood asthma)
  187. Asthma, exercise-induced (See: Exercise-induced asthma)
  188. Asthma, occupational (See: Occupational asthma)
  189. Astigmatism
  190. AT (See: Atrial tachycardia)
  191. Ataxia
  192. Atelectasis
  193. Atherosclerosis (See: Arteriosclerosis / atherosclerosis)
  194. Athlete’s foot
  195. Atopic dermatitis (eczema)
  196. Atrial fibrillation
  197. Atrial flutter
  198. Atrial septal defect
  199. Atrial tachycardia
  200. Atrioventricular canal defect
  201. Atrioventricular nodal reentry tachycardia (AVNRT)
  202. Atrioventricular septal defect (See: Atrioventricular canal defect)
  203. Atrophic vaginitis (See: Vaginal atrophy)
  204. Attachment disorder (See: Reactive attachment disorder)
  205. Attention-deficit/hyperactivity disorder (ADHD) in children
  206. Attention-deficit/hyperactivity disorder in adults (See: Adult attention-deficit/hyperactivity disorder (ADHD))
  207. Atypical depression
  208. Atypical hyperplasia of the breast
  209. Autism spectrum disorder
  210. Autoimmune hepatitis
  211. Autoimmune pancreatitis
  212. Autonomic neuropathy
  213. Avascular necrosis
  214. Avian influenza (See: Bird flu (avian influenza))
  215. AVNRT (See: Atrioventricular nodal reentry tachycardia (AVNRT))
  216. Avoidant personality disorder (See: Personality disorders)
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