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. Hay fever
  21. Head and neck cancers
  22. Head lice
  23. Head trauma, coma, also known asComa)
  24. Headache, chronic daily, also known asChronic daily headaches)
  25. Headache, cluster, also known asCluster headache)
  26. Headache, exercise, also known asExercise headaches)
  27. Headache, external compression, also known asExternal compression headaches)
  28. Headache, ice cream, also known asIce cream 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. Hepatitis A
  65. Hepatitis B
  66. Hepatitis C
  67. Hepatitis, autoimmune, also known asAutoimmune hepatitis)
  68. Hepatitis, toxic, also known asToxic hepatitis)
  69. Hepatocellular carcinoma
  70. Hepatomegaly, also known asEnlarged liver)
  71. Hepatopulmonary syndrome
  72. Hereditary hemochromatosis, also known asHemochromatosis)
  73. Hereditary hemorrhagic telangiectasia
  74. Hereditary motor and sensory neuropathy, also known asCharcot-Marie-Tooth disease)
  75. Hereditary nonpolyposis colorectal cancer syndrome, also known asLynch syndrome)
  76. Hereditary progressive arthro-ophthalmopathy, also known asStickler syndrome)
  77. Hernia, hiatal, also known asHiatal hernia)
  78. Hernia, inguinal, also known asInguinal hernia)
  79. Hernia, umbilical, also known asUmbilical hernia)
  80. Herniated disk
  81. Herpes zoster, also known asShingles)
  82. Herpes zoster oticus, also known asRamsay Hunt syndrome)
  83. Herpes, genital, also known asGenital herpes)
  84. Hiatal hernia
  85. Hiccups
  86. Hidradenitis suppurativa
  87. High blood pressure (hypertension)
  88. High blood pressure in children
  89. High blood pressure, secondary, also known asSecondary hypertension)
  90. High cholesterol
  91. High-flow priapism, also known asPriapism)
  92. Hilar cholangiocarcinoma
  93. Hip dysplasia
  94. Hip fracture
  95. Hip impingement
  96. Hip labral tear
  97. Hirschsprung's disease
  98. Hirsutism
  99. Histoplasmosis
  100. HIV/AIDS
  101. Hives and angioedema
  102. Hives, chronic, also known asChronic hives)
  103. Hoarding disorder
  104. Hoarse voice, also known asLaryngitis)
  105. Hodgkin's disease, also known asHodgkin's lymphoma (Hodgkin's disease))
  106. Hodgkin's lymphoma (Hodgkin's disease)
  107. Hordeolum, also known asSty)
  108. Horner syndrome
  109. Horner-Bernard syndrome, also known asHorner syndrome)
  110. Hot flashes
  111. HPV infection
  112. Human immunodeficiency virus, also known asHIV/AIDS)
  113. Human papillomavirus infection, also known asHPV infection)
  114. Hunchback, also known asKyphosis)
  115. Hunter syndrome
  116. Huntington's disease
  117. Hunt's syndrome, also known asRamsay Hunt syndrome)
  118. Hurthle cell cancer
  119. Hutchinson-Gilford progeria syndrome, also known asProgeria)
  120. Hydrocele
  121. Hydrocephalus
  122. Hydronephrosis
  123. Hypercalcemia
  124. Hypercholesterolemia, also known asHigh cholesterol)
  125. Hypercholesterolemia, familial, also known asFamilial hypercholesterolemia)
  126. Hypercortisolism, also known asCushing syndrome)
  127. Hypereosinophilic syndrome
  128. Hyperglycemia in diabetes
  129. Hyperhidrosis
  130. Hypermenorrhea, also known asMenorrhagia (heavy menstrual bleeding))
  131. Hyperopia, also known asFarsightedness)
  132. Hyperoxaluria and oxalosis
  133. Hyperparathyroidism
  134. Hypersexuality, also known asCompulsive sexual behavior)
  135. Hypertension, also known asHigh blood pressure (hypertension))
  136. Hypertension, pregnancy-related, also known asPreeclampsia)
  137. Hypertension, pulmonary, also known asPulmonary hypertension)
  138. Hyperthyroidism (overactive thyroid)
  139. Hypertrophic cardiomyopathy
  140. Hypoactive sexual desire disorder, also known asLow sex drive in women)
  141. Hypochondria, also known asIllness anxiety disorder)
  142. Hypoglycemia
  143. Hypoglycemia, diabetic, also known asDiabetic hypoglycemia)
  144. Hypohidrosis, also known asAnhidrosis)
  145. Hypohydration, also known asDehydration)
  146. Hyponatremia
  147. Hypoparathyroidism
  148. Hypopituitarism
  149. Hypoplastic left heart syndrome
  150. Hypospadias
  151. Hypotension, also known asLow blood pressure (hypotension))
  152. Hypothermia
  153. Hypothyroidism (underactive thyroid)
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