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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-foot-and-mouth disease
  12. Hangovers
  13. Hantavirus pulmonary syndrome
  14. Hardening of the arteries (See: Arteriosclerosis / atherosclerosis)
  15. Hashimoto's disease
  16. Hay fever
  17. Head and neck cancers
  18. Head lice
  19. Head trauma, coma (See: Coma)
  20. Headache, chronic daily (See: Chronic daily headaches)
  21. Headache, cluster (See: Cluster headache)
  22. Headache, external compression (See: External compression headaches)
  23. Headache, ice cream (See: Ice cream headaches)
  24. Headache, migraine (See: Migraine)
  25. Headache, primary cough (See: Cough headaches)
  26. Headache, rebound (See: Rebound headaches)
  27. Headache, sex (See: Sex headaches)
  28. Headache, sinus (See: Sinus headaches)
  29. Headache, spinal (See: Spinal headaches)
  30. Headache, tension (See: Tension headache)
  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 (See: Indigestion)
  44. Heartburn
  45. Heat exhaustion
  46. Heat rash
  47. Heatstroke
  48. Heavy menstrual periods (See: Menorrhagia)
  49. Heel pain (See: Plantar fasciitis)
  50. Helicobacter pylori (See: H. pylori infection)
  51. Heller's syndrome (See: Childhood disintegrative disorder)
  52. Hemangioma
  53. Hemangioma, liver (See: Liver hemangioma)
  54. Hematoma, intracranial (See: Intracranial hematoma)
  55. Hematuria (See: Blood in urine (hematuria))
  56. Hemifacial spasm
  57. Hemochromatosis
  58. Hemolytic uremic syndrome (HUS)
  59. Hemophilia
  60. Hemorrhoids
  61. Henoch-Schonlein purpura
  62. Hepatitis A
  63. Hepatitis B
  64. Hepatitis C
  65. Hepatitis, alcoholic (See: Alcoholic hepatitis)
  66. Hepatitis, autoimmune (See: Autoimmune hepatitis)
  67. Hepatitis, toxic (See: Toxic hepatitis)
  68. Hepatocellular carcinoma (See: Liver cancer)
  69. Hepatomegaly (See: Enlarged liver)
  70. Hepatopulmonary syndrome
  71. Hereditary hemochromatosis (See: Hemochromatosis)
  72. Hereditary hemorrhagic telangiectasia
  73. Hereditary motor and sensory neuropathy (See: Charcot-Marie-Tooth disease)
  74. Hereditary nonpolyposis colorectal cancer syndrome (See: Lynch syndrome)
  75. Hereditary progressive arthro-ophthalmopathy (See: Stickler syndrome)
  76. Hernia, diaphragmatic (See: Hiatal hernia)
  77. Hernia, hiatal (See: Hiatal hernia)
  78. Hernia, inguinal (See: Inguinal hernia)
  79. Hernia, umbilical (See: Umbilical hernia)
  80. Herniated disk
  81. Herpes zoster (See: Shingles)
  82. Herpes zoster oticus (See: Ramsay Hunt syndrome)
  83. Herpes, genital (See: Genital 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 (See: Secondary hypertension)
  90. High cholesterol
  91. High-flow priapism (See: Priapism)
  92. Hip dysplasia
  93. Hip fracture
  94. Hip impingement
  95. Hip labral tear
  96. Hirschsprung's disease
  97. Hirsutism
  98. Histoplasmosis
  99. Histrionic personality disorder (See: Personality disorders)
  100. HIV/AIDS
  101. Hives and angioedema
  102. Hives, chronic (See: Chronic hives (urticaria))
  103. Hoarding disorder
  104. Hoarse voice (See: Laryngitis)
  105. Hodgkin's disease (See: Hodgkin's lymphoma)
  106. Hodgkin's lymphoma
  107. Hordeolum (See: Sty)
  108. Horner syndrome
  109. Hot flashes
  110. HPV infection
  111. Human immunodeficiency virus (See: HIV/AIDS)
  112. Human papillomavirus infection (See: HPV infection)
  113. Hunchback (See: Kyphosis)
  114. Hunter syndrome
  115. Huntington's disease
  116. Hunt's syndrome (See: Ramsay Hunt syndrome)
  117. Hurthle cell cancer
  118. Hutchinson-Gilford progeria syndrome (See: Progeria)
  119. Hydrocele
  120. Hydrocephalus
  121. Hypercalcemia
  122. Hypercholesterolemia (See: High cholesterol)
  123. Hypercortisolism (See: Cushing syndrome)
  124. Hypereosinophilic syndrome
  125. Hyperglycemia in diabetes
  126. Hyperhidrosis (excessive sweating)
  127. Hypermenorrhea (See: Menorrhagia)
  128. Hyperopia (See: Farsightedness)
  129. Hyperoxaluria and oxalosis
  130. Hyperparathyroidism
  131. Hypersexuality (See: Compulsive sexual behavior)
  132. Hypertension (See: High blood pressure (hypertension))
  133. Hypertension, pregnancy-related (See: Preeclampsia)
  134. Hypertension, pulmonary (See: Pulmonary hypertension)
  135. Hyperthyroidism
  136. Hypertrophic cardiomyopathy
  137. Hypoactive sexual desire disorder (See: Low sex drive in women)
  138. Hypochondria
  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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