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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)
  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, tension (See: Tension headache)
  32. Headache, thunderclap (See: Thunderclap headaches)
  33. Headaches in children
  34. Headaches, exercise (See: Exercise headaches)
  35. Hearing loss
  36. Heart arrhythmias
  37. Heart attack
  38. Heart defects in adults (See: Congenital heart disease in adults)
  39. Heart disease
  40. Heart failure
  41. Heart murmurs
  42. Heart palpitations
  43. Heart valve disease
  44. Heartburn (See: Indigestion)
  45. Heartburn
  46. Heat exhaustion
  47. Heat rash
  48. Heatstroke
  49. Heavy menstrual periods (See: Menorrhagia)
  50. Heel pain (See: Plantar fasciitis)
  51. Helicobacter pylori (See: H. pylori infection)
  52. Heller's syndrome (See: Childhood disintegrative disorder)
  53. Hemangioma
  54. Hemangioma, liver (See: Liver hemangioma)
  55. Hematoma, intracranial (See: Intracranial hematoma)
  56. Hematuria (See: Blood in urine (hematuria))
  57. Hemifacial spasm
  58. Hemochromatosis
  59. Hemolytic uremic syndrome (HUS)
  60. Hemophilia
  61. Hemorrhoids
  62. Henoch-Schonlein purpura
  63. Hepatitis A
  64. Hepatitis B
  65. Hepatitis C
  66. Hepatitis, alcoholic (See: Alcoholic hepatitis)
  67. Hepatitis, autoimmune (See: Autoimmune hepatitis)
  68. Hepatitis, toxic (See: Toxic hepatitis)
  69. Hepatocellular carcinoma (See: Liver cancer)
  70. Hepatomegaly (See: Enlarged liver)
  71. Hepatopulmonary syndrome
  72. Hereditary hemochromatosis (See: Hemochromatosis)
  73. Hereditary hemorrhagic telangiectasia
  74. Hereditary motor and sensory neuropathy (See: Charcot-Marie-Tooth disease)
  75. Hereditary nonpolyposis colorectal cancer syndrome (See: Lynch syndrome)
  76. Hereditary progressive arthro-ophthalmopathy (See: Stickler syndrome)
  77. Hernia, diaphragmatic (See: Hiatal hernia)
  78. Hernia, hiatal (See: Hiatal hernia)
  79. Hernia, inguinal (See: Inguinal hernia)
  80. Hernia, umbilical (See: Umbilical hernia)
  81. Herniated disk
  82. Herpes zoster (See: Shingles)
  83. Herpes zoster oticus (See: Ramsay Hunt syndrome)
  84. Herpes, genital (See: Genital herpes)
  85. Hiatal hernia
  86. Hiccups
  87. Hidradenitis suppurativa
  88. High blood pressure (hypertension)
  89. High blood pressure in children
  90. High blood pressure, secondary (See: Secondary hypertension)
  91. High cholesterol
  92. High-flow priapism (See: Priapism)
  93. Hip dysplasia
  94. Hip fracture
  95. Hip impingement
  96. Hip labral tear
  97. Hirschsprung's disease
  98. Hirsutism
  99. Histoplasmosis
  100. Histrionic personality disorder (See: Personality disorders)
  101. HIV/AIDS
  102. Hives and angioedema
  103. Hives, chronic (See: Chronic hives (urticaria))
  104. Hoarding disorder
  105. Hoarse voice (See: Laryngitis)
  106. Hodgkin's disease (See: Hodgkin's lymphoma)
  107. Hodgkin's lymphoma
  108. Hordeolum (See: Sty)
  109. Horner syndrome
  110. Hot flashes
  111. HPV infection
  112. Human immunodeficiency virus (See: HIV/AIDS)
  113. Human papillomavirus infection (See: HPV infection)
  114. Hunchback (See: Kyphosis)
  115. Hunter syndrome
  116. Huntington's disease
  117. Hunt's syndrome (See: Ramsay Hunt syndrome)
  118. Hurthle cell cancer
  119. Hutchinson-Gilford progeria syndrome (See: Progeria)
  120. Hydrocele
  121. Hydrocephalus
  122. Hypercalcemia
  123. Hypercholesterolemia (See: High cholesterol)
  124. Hypercortisolism (See: Cushing syndrome)
  125. Hypereosinophilic syndrome
  126. Hyperglycemia in diabetes
  127. Hyperhidrosis
  128. Hypermenorrhea (See: Menorrhagia)
  129. Hyperopia (See: Farsightedness)
  130. Hyperoxaluria and oxalosis
  131. Hyperparathyroidism
  132. Hypersexuality (See: Compulsive sexual behavior)
  133. Hypertension (See: High blood pressure (hypertension))
  134. Hypertension, pregnancy-related (See: Preeclampsia)
  135. Hypertension, pulmonary (See: Pulmonary hypertension)
  136. Hyperthyroidism
  137. Hypertrophic cardiomyopathy
  138. Hypoactive sexual desire disorder (See: Low sex drive in women)
  139. Hypocortisolism (See: Addison's disease)
  140. Hypoglycemia
  141. Hypoglycemia, diabetic (See: Diabetic hypoglycemia)
  142. Hypogonadism, male (See: Male hypogonadism)
  143. Hypohidrosis (See: Anhidrosis)
  144. Hypohydration (See: Dehydration)
  145. Hyponatremia
  146. Hypoparathyroidism
  147. Hypopharyngeal cancer (See: Throat cancer)
  148. Hypopituitarism
  149. Hypoplastic left heart syndrome
  150. Hypospadias
  151. Hypotension (See: Low blood pressure (hypotension))
  152. Hypothermia
  153. Hypothyroidism
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