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