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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 kidney failure
  19. Acute liver failure
  20. Acute lymphocytic leukemia
  21. Acute lyphoblastic leukemia (See: Acute lymphocytic leukemia)
  22. Acute lyphoid leukemia (See: Acute lymphocytic leukemia)
  23. Acute myelogenous leukemia (AML)
  24. Acute radiation sickness (See: Radiation sickness)
  25. Acute radiation syndrome (See: Radiation sickness)
  26. Acute respiratory distress syndrome (See: ARDS)
  27. Acute sinusitis
  28. Addiction, alcohol (See: Alcoholism)
  29. Addiction, drug (See: Drug addiction)
  30. Addiction, gambling (See: Compulsive gambling)
  31. Addiction, nicotine (See: Nicotine dependence)
  32. Addiction, tobacco (See: Nicotine dependence)
  33. Addison's disease
  34. Adenitis, mesenteric (See: Mesenteric lymphadenitis)
  35. Adenomyosis
  36. ADHD in children
  37. ADHD, Adult (See: Adult ADHD)
  38. ADHD, in children (See: ADHD in children)
  39. Adhesive capsulitis (See: Frozen shoulder)
  40. Adjustment disorders
  41. Adnexal tumors
  42. Adolescent schizophrenia (See: Childhood schizophrenia)
  43. Adrenal cancer
  44. Adrenal gland tumor (See: Pheochromocytoma)
  45. Adrenal insufficiency (See: Addison's disease)
  46. Adrenoleukodystrophy
  47. Adult ADHD
  48. Adult ADHD (attention-deficit/hyperactivity disorder) (See: Adult ADHD)
  49. Adult Still's disease
  50. Age spots (liver spots)
  51. Age-related macular degeneration, dry (See: Macular degeneration, dry)
  52. Age-related macular degeneration, wet (See: Macular degeneration, wet)
  53. Agnogenic myeloid metaplasia (See: Myelofibrosis)
  54. Agoraphobia
  55. AIDS/HIV (See: HIV/AIDS)
  56. Airplane ear
  57. Albinism
  58. Alcohol addiction (See: Alcoholism)
  59. Alcohol intolerance
  60. Alcohol poisoning
  61. Alcoholic hepatitis
  62. Alcoholism
  63. Alcohol-related birth defects (See: Fetal alcohol syndrome)
  64. Alcohol-related neurodevelopmental disorder (See: Fetal alcohol syndrome)
  65. Aldosteronoma (See: Primary aldosteronism)
  66. Allergic angiitis (See: Churg-Strauss syndrome)
  67. Allergic granulomatosis (See: Churg-Strauss syndrome)
  68. Allergic reaction (See: Allergies)
  69. Allergic rhinitis (See: Hay fever)
  70. Allergies
  71. Allergy, dust mite (See: Dust mite allergy)
  72. Allergy, egg (See: Egg allergy)
  73. Allergy, food (See: Food allergy)
  74. Allergy, latex (See: Latex allergy)
  75. Allergy, milk (See: Milk allergy)
  76. Allergy, mold (See: Mold allergy)
  77. Allergy, nickel (See: Nickel allergy)
  78. Allergy, peanut (See: Peanut allergy)
  79. Allergy, penicillin (See: Penicillin allergy)
  80. Allergy, pet (See: Pet allergy)
  81. Allergy, shellfish (See: Shellfish allergy)
  82. Allergy, soy (See: Soy allergy)
  83. Allergy, wheat (See: Wheat allergy)
  84. Alopecia (See: Hair loss)
  85. ALS (See: Amyotrophic lateral sclerosis)
  86. Alveolar osteitis (See: Dry socket)
  87. Alzheimer's disease
  88. Ambiguous genitalia
  89. Amblyopia (See: Lazy eye (amblyopia))
  90. Ameloblastoma
  91. Amenorrhea
  92. American trypanosomiasis (See: Chagas disease)
  93. Amnesia
  94. Amnesia, dissociative (See: Dissociative disorders)
  95. Amnesia, transient global (See: Transient global amnesia)
  96. Amnestic syndrome (See: Amnesia)
  97. Amniotic fluid embolism
  98. Ampullary cancer
  99. Amyloidosis
  100. Amyotrophic lateral sclerosis
  101. Anal cancer
  102. Anal fissure
  103. Anal fistula
  104. Anal itching
  105. Anaphylaxis
  106. Anaplasmosis (See: Ehrlichiosis)
  107. Anemia
  108. Anemia, aplastic (See: Aplastic anemia)
  109. Anemia, Cooley's (See: Thalassemia)
  110. Anemia, iron deficiency (See: Iron deficiency anemia)
  111. Anemia, Mediterranean (See: Thalassemia)
  112. Anemia, sickle cell (See: Sickle cell anemia)
  113. Anemia, vitamin deficiency (See: Vitamin deficiency anemia)
  114. Aneurysm, abdominal aortic (See: Abdominal aortic aneurysm)
  115. Aneurysm, aortic (See: Thoracic 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 nervosa
  132. Anorgasmia
  133. Anterior cruciate ligament injury (See: ACL injury)
  134. Anterior prolapse (cystocele)
  135. Anthrax
  136. Antibiotic-associated colitis (See: Pseudomembranous colitis)
  137. Antibiotic-associated diarrhea
  138. Antiphospholipid syndrome
  139. Antisocial personality disorder
  140. Anxiety
  141. Anxiety (See: 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. Ataxia
  191. Atelectasis
  192. Atherosclerosis (See: Arteriosclerosis / atherosclerosis)
  193. Athlete's foot
  194. Atopic dermatitis (eczema)
  195. Atrial fibrillation
  196. Atrial flutter
  197. Atrial septal defect
  198. Atrioventricular canal defect
  199. Atrioventricular septal defect (See: Atrioventricular canal defect)
  200. Atrophic vaginitis (See: Vaginal atrophy)
  201. Attachment disorder (See: Reactive attachment disorder)
  202. Attention-deficit/hyperactivity disorder (ADHD) in children (See: ADHD in children)
  203. Atypical depression
  204. Atypical hyperplasia of the breast
  205. Autism spectrum disorder
  206. Autoimmune hepatitis
  207. Autoimmune pancreatitis
  208. Autonomic neuropathy
  209. Avascular necrosis
  210. Avian influenza (See: Bird flu (avian influenza))
  211. Avoidant personality disorder (See: Personality disorders)
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