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  1. H. pylori infection, also known asHelicobacter pylori (H. pylori) infection)
  2. H1N1 flu, also known asH1N1 flu (swine flu))
  3. H1N1 flu (swine flu)
  4. H1N1v flu, also known asH1N1 flu (swine flu))
  5. H3N2v flu, also known asH1N1 flu (swine flu))
  6. Hair loss
  7. Hair-pulling disorder, also known asTrichotillomania (hair-pulling disorder))
  8. Hairy cell leukemia
  9. Hairy tongue, also known asBlack hairy tongue)
  10. Halitosis, also known asBad breath)
  11. Hammertoe and mallet toe
  12. Hamstring injury
  13. Hand fracture, also known asBroken hand)
  14. Hand-foot-and-mouth disease
  15. Hangovers
  16. Hantavirus pulmonary syndrome
  17. Hardening of the arteries, also known asArteriosclerosis / atherosclerosis)
  18. Hashimoto's disease
  19. HAV infection, also known asHepatitis A)
  20. Hay fever
  21. HBV infection, also known asHepatitis B)
  22. HCC, also known asHepatocellular carcinoma)
  23. HCV infection, also known asHepatitis C)
  24. Head and neck cancers
  25. Head lice
  26. Head trauma, coma, also known asComa)
  27. Headache, chronic daily, also known asChronic daily headaches)
  28. Headache, cluster, also known asCluster headache)
  29. Headache, exercise, also known asExercise headaches)
  30. Headache, migraine, also known asMigraine)
  31. Headache, primary cough, also known asCough headaches)
  32. Headache, sex, also known asSex headaches)
  33. Headache, sinus, also known asSinus headaches)
  34. Headache, spinal, also known asSpinal headaches)
  35. Headache, tension, also known asTension headache)
  36. Headache, thunderclap, also known asThunderclap headaches)
  37. Headaches in children
  38. Health anxiety, also known asIllness anxiety disorder)
  39. Hearing loss
  40. Heart arrhythmia
  41. Heart attack
  42. Heart defects in adults, also known asCongenital heart disease in adults)
  43. Heart disease
  44. Heart failure
  45. Heart murmurs
  46. Heart palpitations
  47. Heart valve disease
  48. Heartburn
  49. Heat exhaustion
  50. Heat rash
  51. Heatstroke
  52. Heavy menstrual bleeding
  53. Heel pain, also known asPlantar fasciitis)
  54. Helicobacter pylori (H. pylori) infection
  55. Hemangioma
  56. Hemangioma, liver, also known asLiver hemangioma)
  57. Hematoma, intracranial, also known asIntracranial hematoma)
  58. Hematuria, also known asBlood in urine (hematuria))
  59. Hemifacial spasm
  60. Hemochromatosis
  61. Hemolytic uremic syndrome (HUS)
  62. Hemophilia
  63. Hemorrhoids
  64. Henoch-Schonlein purpura
  65. Hep A, also known asHepatitis A)
  66. Hep B, also known asHepatitis B)
  67. Hep C, also known asHepatitis C)
  68. Hepatitis A
  69. Hepatitis A virus infection, also known asHepatitis A)
  70. Hepatitis B
  71. Hepatitis B virus infection, also known asHepatitis B)
  72. Hepatitis C
  73. Hepatitis C virus infection, also known asHepatitis C)
  74. Hepatitis, autoimmune, also known asAutoimmune hepatitis)
  75. Hepatitis, toxic, also known asToxic hepatitis)
  76. Hepatocellular carcinoma
  77. Hepatolenticular degeneration, also known asWilson's disease)
  78. Hepatomegaly, also known asEnlarged liver)
  79. Hepatopulmonary syndrome
  80. Hereditary hemochromatosis, also known asHemochromatosis)
  81. Hereditary hemorrhagic telangiectasia
  82. Hereditary motor and sensory neuropathy, also known asCharcot-Marie-Tooth disease)
  83. Hereditary nonpolyposis colorectal cancer syndrome, also known asLynch syndrome)
  84. Hernia, hiatal, also known asHiatal hernia)
  85. Hernia, inguinal, also known asInguinal hernia)
  86. Hernia, umbilical, also known asUmbilical hernia)
  87. Herniated disk
  88. Herpes zoster, also known asShingles)
  89. Herpes zoster oticus, also known asRamsay Hunt syndrome)
  90. Herpes, genital, also known asGenital herpes)
  91. Hiatal hernia
  92. Hiccups
  93. Hidradenitis suppurativa
  94. High blood pressure (hypertension)
  95. High blood pressure in children
  96. High blood pressure, secondary, also known asSecondary hypertension)
  97. High cholesterol
  98. High-flow priapism, also known asPriapism)
  99. Hilar cholangiocarcinoma
  100. Hip dysplasia
  101. Hip fracture
  102. Hip labral tear
  103. Hirschsprung's disease
  104. Hirsutism
  105. Histoplasmosis
  106. HIV/AIDS
  107. Hives and angioedema
  108. Hives, chronic, also known asChronic hives)
  109. Hoarding disorder
  110. Hoarse voice, also known asLaryngitis)
  111. Hodgkin lymphoma (Hodgkin disease)
  112. Hodgkin's disease, also known asHodgkin's lymphoma (Hodgkin's disease))
  113. Hodgkin's disease, also known asHodgkin lymphoma (Hodgkin disease))
  114. Hodgkin's lymphoma (Hodgkin's disease)
  115. Hordeolum, also known asStye (sty))
  116. Horner syndrome
  117. Horner-Bernard syndrome, also known asHorner syndrome)
  118. Hot flashes
  119. HPV infection
  120. Human immunodeficiency virus, also known asHIV/AIDS)
  121. Human papillomavirus infection, also known asHPV infection)
  122. Hunchback, also known asKyphosis)
  123. Hunchback, also known asKyphosis)
  124. Huntington's disease
  125. Hunt's syndrome, also known asRamsay Hunt syndrome)
  126. Hurthle cell cancer
  127. Hutchinson-Gilford progeria syndrome, also known asProgeria)
  128. Hydrocele
  129. Hydrocephalus
  130. Hydronephrosis
  131. Hypercalcemia
  132. Hypercholesterolemia, also known asHigh cholesterol)
  133. Hypercholesterolemia, familial, also known asFamilial hypercholesterolemia)
  134. Hypercortisolism, also known asCushing syndrome)
  135. Hypereosinophilic syndrome
  136. Hyperglycemia in diabetes
  137. Hyperhidrosis
  138. Hypermenorrhea, also known asHeavy menstrual bleeding)
  139. Hyperopia, also known asFarsightedness)
  140. Hyperoxaluria and oxalosis
  141. Hyperparathyroidism
  142. Hypersexuality, also known asCompulsive sexual behavior)
  143. Hypertension, also known asHigh blood pressure (hypertension))
  144. Hypertension, pregnancy-related, also known asPreeclampsia)
  145. Hypertension, pulmonary, also known asPulmonary hypertension)
  146. Hyperthyroidism (overactive thyroid)
  147. Hypertrophic cardiomyopathy
  148. Hypoactive sexual desire disorder, also known asLow sex drive in women)
  149. Hypochondria, also known asIllness anxiety disorder)
  150. Hypoglycemia
  151. Hypoglycemia, diabetic, also known asDiabetic hypoglycemia)
  152. Hypohydration, also known asDehydration)
  153. Hyponatremia
  154. Hypoparathyroidism
  155. Hypopituitarism
  156. Hypoplastic left heart syndrome
  157. Hypospadias
  158. Hypotension, also known asLow blood pressure (hypotension))
  159. Hypothermia
  160. Hypothyroidism (underactive thyroid)
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