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