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