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  1. H. pylori infection
  2. H1N1 flu (See: Swine flu (H1N1 flu))
  3. Hair loss
  4. Hair-pulling disorder (See: Trichotillomania (hair-pulling disorder))
  5. Hairy cell leukemia
  6. Hairy tongue (See: Black hairy tongue)
  7. Halitosis (See: Bad breath)
  8. Hammertoe and mallet toe
  9. Hamstring injury
  10. Hand fracture (See: Broken wrist/broken hand)
  11. Hand pain (See: Wrist pain)
  12. Hand-foot-and-mouth disease
  13. Hangovers
  14. Hantavirus pulmonary syndrome
  15. Hardening of the arteries (See: Arteriosclerosis / atherosclerosis)
  16. Hashimoto's disease
  17. Hay fever
  18. Head and neck cancers
  19. Head lice
  20. Head trauma, coma (See: Coma)
  21. Headache, chronic daily (See: Chronic daily headaches)
  22. Headache, cluster (See: Cluster headache)
  23. Headache, external compression (See: External compression headaches)
  24. Headache, ice cream (See: Ice cream headaches)
  25. Headache, migraine (See: Migraine)
  26. Headache, primary cough (See: Cough headaches)
  27. Headache, rebound (See: Rebound headaches)
  28. Headache, sex (See: Sex headaches)
  29. Headache, sinus (See: Sinus headaches)
  30. Headache, spinal (See: Spinal headaches)
  31. Headache, thunderclap (See: Thunderclap headaches)
  32. Headaches in children
  33. Headaches, exercise (See: Exercise headaches)
  34. Hearing loss
  35. Heart arrhythmias
  36. Heart attack
  37. Heart defects in adults (See: Congenital heart disease in adults)
  38. Heart disease
  39. Heart failure
  40. Heart murmurs
  41. Heart palpitations
  42. Heart valve disease
  43. Heartburn
  44. Heat exhaustion
  45. Heat rash
  46. Heatstroke
  47. Heavy menstrual periods (See: Menorrhagia)
  48. Heel pain (See: Plantar fasciitis)
  49. Helicobacter pylori (See: H. pylori infection)
  50. Hemangioma
  51. Hemangioma, liver (See: Liver hemangioma)
  52. Hematoma, intracranial (See: Intracranial hematoma)
  53. Hematuria (See: Blood in urine (hematuria))
  54. Hemifacial spasm
  55. Hemochromatosis
  56. Hemolytic uremic syndrome (HUS)
  57. Hemophilia
  58. Hemorrhoids
  59. Henoch-Schonlein purpura
  60. Hepatitis A
  61. Hepatitis B
  62. Hepatitis C
  63. Hepatitis, alcoholic (See: Alcoholic hepatitis)
  64. Hepatitis, autoimmune (See: Autoimmune hepatitis)
  65. Hepatitis, toxic (See: Toxic hepatitis)
  66. Hepatocellular carcinoma
  67. Hepatomegaly (See: Enlarged liver)
  68. Hepatopulmonary syndrome
  69. Hereditary hemochromatosis (See: Hemochromatosis)
  70. Hereditary hemorrhagic telangiectasia
  71. Hereditary motor and sensory neuropathy (See: Charcot-Marie-Tooth disease)
  72. Hereditary nonpolyposis colorectal cancer syndrome (See: Lynch syndrome)
  73. Hereditary progressive arthro-ophthalmopathy (See: Stickler syndrome)
  74. Hernia, diaphragmatic (See: Hiatal hernia)
  75. Hernia, hiatal (See: Hiatal hernia)
  76. Hernia, inguinal (See: Inguinal hernia)
  77. Hernia, umbilical (See: Umbilical hernia)
  78. Herniated disk
  79. Herpes zoster (See: Shingles)
  80. Herpes zoster oticus (See: Ramsay Hunt syndrome)
  81. Herpes, genital (See: Genital herpes)
  82. Hiatal hernia
  83. Hiccups
  84. Hidradenitis suppurativa
  85. High blood pressure (hypertension)
  86. High blood pressure in children
  87. High blood pressure, secondary (See: Secondary hypertension)
  88. High cholesterol
  89. High-flow priapism (See: Priapism)
  90. Hilar cholangiocarcinoma
  91. Hip dysplasia
  92. Hip fracture
  93. Hip impingement
  94. Hip labral tear
  95. Hirschsprung's disease
  96. Hirsutism
  97. Histoplasmosis
  98. Histrionic personality disorder (See: Personality disorders)
  99. HIV/AIDS
  100. Hives and angioedema
  101. Hives, chronic (See: Chronic hives (urticaria))
  102. Hoarding disorder
  103. Hoarse voice (See: Laryngitis)
  104. Hodgkin's disease (See: Hodgkin's lymphoma)
  105. Hodgkin's lymphoma
  106. Hordeolum (See: Sty)
  107. Horner syndrome
  108. Hot flashes
  109. HPV infection
  110. Human immunodeficiency virus (See: HIV/AIDS)
  111. Human papillomavirus infection (See: HPV infection)
  112. Hunchback (See: Kyphosis)
  113. Hunter syndrome
  114. Huntington's disease
  115. Hunt's syndrome (See: Ramsay Hunt syndrome)
  116. Hurthle cell cancer
  117. Hutchinson-Gilford progeria syndrome (See: Progeria)
  118. Hydrocele
  119. Hydrocephalus
  120. Hypercalcemia
  121. Hypercholesterolemia (See: High cholesterol)
  122. Hypercortisolism (See: Cushing syndrome)
  123. Hypereosinophilic syndrome
  124. Hyperglycemia in diabetes
  125. Hyperhidrosis
  126. Hypermenorrhea (See: Menorrhagia)
  127. Hyperopia (See: Farsightedness)
  128. Hyperoxaluria and oxalosis
  129. Hyperparathyroidism
  130. Hypersexuality (See: Compulsive sexual behavior)
  131. Hypertension (See: High blood pressure (hypertension))
  132. Hypertension, pregnancy-related (See: Preeclampsia)
  133. Hypertension, pulmonary (See: Pulmonary hypertension)
  134. Hyperthyroidism
  135. Hypertrophic cardiomyopathy
  136. Hypoactive sexual desire disorder (See: Low sex drive in women)
  137. Hypocortisolism (See: Addison's disease)
  138. Hypoglycemia
  139. Hypoglycemia, diabetic (See: Diabetic hypoglycemia)
  140. Hypogonadism, male (See: Male hypogonadism)
  141. Hypohidrosis (See: Anhidrosis)
  142. Hypohydration (See: Dehydration)
  143. Hyponatremia
  144. Hypoparathyroidism
  145. Hypopharyngeal cancer (See: Throat cancer)
  146. Hypopituitarism
  147. Hypoplastic left heart syndrome
  148. Hypospadias
  149. Hypotension (See: Low blood pressure (hypotension))
  150. Hypothermia
  151. Hypothyroidism
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