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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 pain, also known asWrist pain)
  15. Hand-foot-and-mouth disease
  16. Hangovers
  17. Hantavirus pulmonary syndrome
  18. Hardening of the arteries, also known asArteriosclerosis / atherosclerosis)
  19. Hashimoto's disease
  20. HAV infection, also known asHepatitis A)
  21. Hay fever
  22. HBV infection, also known asHepatitis B)
  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, ice cream, also known asIce cream headaches)
  31. Headache, migraine, also known asMigraine)
  32. Headache, primary cough, also known asCough headaches)
  33. Headache, sex, also known asSex headaches)
  34. Headache, sinus, also known asSinus headaches)
  35. Headache, spinal, also known asSpinal headaches)
  36. Headache, tension, also known asTension headache)
  37. Headache, thunderclap, also known asThunderclap headaches)
  38. Headaches in children
  39. Health anxiety, also known asIllness anxiety disorder)
  40. Hearing loss
  41. Heart arrhythmia
  42. Heart attack
  43. Heart defects in adults, also known asCongenital heart disease in adults)
  44. Heart disease
  45. Heart failure
  46. Heart murmurs
  47. Heart palpitations
  48. Heart valve disease
  49. Heartburn
  50. Heat exhaustion
  51. Heat rash
  52. Heatstroke
  53. Heavy menstrual periods, also known asMenorrhagia (heavy menstrual bleeding))
  54. Heel pain, also known asPlantar fasciitis)
  55. Helicobacter pylori (H. pylori) infection
  56. Hemangioma
  57. Hemangioma, liver, also known asLiver hemangioma)
  58. Hematoma, intracranial, also known asIntracranial hematoma)
  59. Hematuria, also known asBlood in urine (hematuria))
  60. Hemifacial spasm
  61. Hemochromatosis
  62. Hemolytic uremic syndrome (HUS)
  63. Hemophilia
  64. Hemorrhoids
  65. Henoch-Schonlein purpura
  66. Hep A, also known asHepatitis A)
  67. Hep B, also known asHepatitis B)
  68. Hep C, also known asHepatitis C)
  69. Hepatitis A
  70. Hepatitis A virus infection, also known asHepatitis A)
  71. Hepatitis B
  72. Hepatitis B virus infection, also known asHepatitis B)
  73. Hepatitis C
  74. Hepatitis C virus infection, also known asHepatitis C)
  75. Hepatitis, autoimmune, also known asAutoimmune hepatitis)
  76. Hepatitis, toxic, also known asToxic hepatitis)
  77. Hepatocellular carcinoma
  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. Hereditary progressive arthro-ophthalmopathy, also known asStickler syndrome)
  85. Hernia, hiatal, also known asHiatal hernia)
  86. Hernia, inguinal, also known asInguinal hernia)
  87. Hernia, umbilical, also known asUmbilical hernia)
  88. Herniated disk
  89. Herpes zoster, also known asShingles)
  90. Herpes zoster oticus, also known asRamsay Hunt syndrome)
  91. Herpes, genital, also known asGenital herpes)
  92. Hiatal hernia
  93. Hiccups
  94. Hidradenitis suppurativa
  95. High blood pressure (hypertension)
  96. High blood pressure in children
  97. High blood pressure, secondary, also known asSecondary hypertension)
  98. High cholesterol
  99. High-flow priapism, also known asPriapism)
  100. Hilar cholangiocarcinoma
  101. Hip dysplasia
  102. Hip fracture
  103. Hip impingement
  104. Hip labral tear
  105. Hirschsprung's disease
  106. Hirsutism
  107. Histoplasmosis
  108. HIV/AIDS
  109. Hives and angioedema
  110. Hives, chronic, also known asChronic hives)
  111. Hoarding disorder
  112. Hoarse voice, also known asLaryngitis)
  113. Hodgkin's disease, also known asHodgkin's lymphoma (Hodgkin's disease))
  114. Hodgkin's lymphoma (Hodgkin's disease)
  115. Hordeolum, also known asSty)
  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. Hunter syndrome
  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 asMenorrhagia (heavy 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. Hypohidrosis, also known asAnhidrosis)
  153. Hypohydration, also known asDehydration)
  154. Hyponatremia
  155. Hypoparathyroidism
  156. Hypopituitarism
  157. Hypoplastic left heart syndrome
  158. Hypospadias
  159. Hypotension, also known asLow blood pressure (hypotension))
  160. Hypothermia
  161. Hypothyroidism (underactive thyroid)
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