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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
  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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