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