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