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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: Alcoholism)
  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: Alcoholism)
  62. Alcohol intolerance
  63. Alcohol poisoning
  64. Alcoholic hepatitis
  65. Alcoholism
  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. Aneurysms
  120. Angelman syndrome
  121. Angiitis (See: Vasculitis)
  122. Angiitis, allergic (See: Churg-Strauss syndrome)
  123. Angina
  124. Angina pectoris (See: Angina)
  125. Angioedema and hives (See: Hives and angioedema)
  126. Angiofollicular lymph node hyperplasia (See: Castleman disease)
  127. Anhidrosis
  128. Ankle fracture (See: Broken ankle/broken foot)
  129. Ankle sprain (See: Sprained ankle)
  130. Ankyloglossia (See: Tongue-tie (ankyloglossia))
  131. Ankylosing spondylitis
  132. Anorexia nervosa
  133. Anorexia nervosa (See: Anorexia nervosa)
  134. Anorgasmia
  135. Anterior cruciate ligament injury (See: ACL injury)
  136. Anterior prolapse (cystocele)
  137. Anthrax
  138. Antibiotic-associated colitis (See: Pseudomembranous colitis)
  139. Antibiotic-associated diarrhea
  140. Antiphospholipid syndrome
  141. Antisocial personality disorder
  142. Anxiety
  143. Anxiety (See: Anxiety)
  144. Anxiety disorder, generalized (See: Generalized anxiety disorder)
  145. Anxiety disorder, social (See: Social anxiety disorder)
  146. Aortic aneurysm
  147. Aortic coarctation (See: Coarctation of the aorta)
  148. Aortic dissection
  149. Aortic valve disease
  150. Aortic valve regurgitation
  151. Aortic valve stenosis
  152. Aphasia
  153. Aphasia, primary progressive (See: Primary progressive aphasia)
  154. Aphthous ulcer (See: Canker sore)
  155. Apical ballooning syndrome (See: Broken heart syndrome)
  156. Aplastic anemia
  157. Apnea, sleep (See: Sleep apnea)
  158. Apnea, sleep (central) (See: Sleep apnea, central)
  159. Apnea, sleep (obstructive) (See: Sleep apnea, obstructive)
  160. Appendicitis
  161. ARDS
  162. Arenaviruses (See: Viral hemorrhagic fevers)
  163. Argentine hemorrhagic fever (See: Viral hemorrhagic fevers)
  164. Arm fracture (See: Broken arm)
  165. Arrhythmia (See: Heart arrhythmias)
  166. Arteriosclerosis / atherosclerosis
  167. Arteriovenous fistula
  168. Arteriovenous malformation
  169. Arteritis, giant cell (See: Giant cell arteritis)
  170. Arteritis, Takayasu's (See: Takayasu's arteritis)
  171. Arthritis
  172. Arthritis, basal joint (See: Thumb arthritis)
  173. Arthritis, gouty (See: Gout)
  174. Arthritis, infectious (See: Septic arthritis)
  175. Arthritis, juvenile rheumatoid (See: Juvenile rheumatoid arthritis)
  176. Arthritis, osteoarthritis (See: Osteoarthritis)
  177. Arthritis, psoriatic (See: Psoriatic arthritis)
  178. Arthritis, reactive (See: Reactive arthritis)
  179. Arthritis, rheumatoid (See: Rheumatoid arthritis)
  180. Arthritis, septic (See: Septic arthritis)
  181. Arthritis, thumb (See: Thumb arthritis)
  182. Asbestosis
  183. Ascariasis
  184. ASD (See: Atrial septal defect)
  185. Aspergillosis
  186. Asthma
  187. Asthma attack
  188. Asthma, childhood (See: Childhood asthma)
  189. Asthma, exercise-induced (See: Exercise-induced asthma)
  190. Asthma, occupational (See: Occupational asthma)
  191. Astigmatism
  192. Ataxia
  193. Atelectasis
  194. Atherosclerosis (See: Arteriosclerosis / atherosclerosis)
  195. Athlete's foot
  196. Atopic dermatitis (eczema)
  197. Atrial fibrillation
  198. Atrial flutter
  199. Atrial septal defect
  200. Atrioventricular canal defect
  201. Atrioventricular septal defect (See: Atrioventricular canal defect)
  202. Atrophic vaginitis (See: Vaginal atrophy)
  203. Attachment disorder (See: Reactive attachment disorder)
  204. Attention-deficit/hyperactivity disorder (ADHD) in children (See: ADHD in children)
  205. Atypical depression
  206. Atypical hyperplasia of the breast
  207. Autism spectrum disorder
  208. Autoimmune hepatitis
  209. Autoimmune pancreatitis
  210. Autonomic neuropathy
  211. Avascular necrosis
  212. Avian influenza (See: Bird flu (avian influenza))
  213. Avoidant personality disorder (See: Personality disorders)
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