1. IBD, also known asInflammatory bowel disease (IBD))
  2. IBS, also known asIrritable bowel syndrome)
  3. Ice cream headaches
  4. Ichthyosis vulgaris
  5. Idiopathic hypersomnia
  6. Idiopathic intracranial hypertension, also known asPseudotumor cerebri (idiopathic intracranial hypertension))
  7. Idiopathic myelofibrosis, also known asMyelofibrosis)
  8. Idiopathic thrombocytopenic purpura, also known asImmune thrombocytopenia (ITP))
  9. Idiopathic toe walking, also known asToe walking in children)
  10. IgA nephropathy (Berger's disease)
  11. IgA vasculitis, also known asHenoch-Schonlein purpura)
  12. IIH, also known asPseudotumor cerebri (idiopathic intracranial hypertension))
  13. Illness anxiety disorder
  14. Immune thrombocytopenia (ITP)
  15. Immune thrombocytopenic purpura, also known asImmune thrombocytopenia (ITP))
  16. Impacted wisdom teeth
  17. Impaired glucose tolerance, also known asPrediabetes)
  18. Impetigo
  19. Impotence, also known asErectile dysfunction)
  20. Inborn error of metabolism, also known asInherited metabolic disorders)
  21. Incompetent cervix
  22. Incomplete fracture, also known asGreenstick fractures)
  23. Incontinence, bowel, also known asFecal incontinence)
  24. Incontinence, fecal, also known asFecal incontinence)
  25. Incontinence, nighttime, also known asBed-wetting)
  26. Incontinence, urinary, also known asUrinary incontinence)
  27. Indigestion
  28. Infant jaundice
  29. Infant reflux
  30. Infantile hemangioma, also known asHemangioma)
  31. Infectious arthritis, also known asSeptic arthritis)
  32. Infectious diseases
  33. Infertility
  34. Infertility, female, also known asFemale infertility)
  35. Infertility, male, also known asMale infertility)
  36. Inflammatory bowel disease (IBD)
  37. Inflammatory breast cancer
  38. Inflammed gallbladder, also known asCholecystitis)
  39. Inflammed pancreas, also known asPancreatitis)
  40. Inflammed pericardium, also known asPericarditis)
  41. Influenza (flu)
  42. Influenza, avian, also known asBird flu (avian influenza))
  43. Influenza, H1N1, also known asH1N1 flu (swine flu))
  44. Influenza, swine flu, also known asH1N1 flu (swine flu))
  45. Ingrown hair
  46. Ingrown toenails
  47. Inguinal hernia
  48. Inherited metabolic disorders
  49. Insomnia
  50. Insulin resistance syndrome, also known asMetabolic syndrome)
  51. Intermittent explosive disorder
  52. Interstitial cystitis
  53. Interstitial lung disease
  54. Intestinal ischemia
  55. Intestinal lipodystrophy, also known asWhipple's disease)
  56. Intestinal obstruction
  57. Intracranial hematoma
  58. Intracranial venous malformations
  59. Intraductal carcinoma, also known asDuctal carcinoma in situ (DCIS))
  60. Intrahepatic cholestasis of pregnancy, also known asCholestasis of pregnancy)
  61. Intraocular melanoma, also known asEye melanoma)
  62. Intussusception
  63. Invasive lobular carcinoma
  64. Iritis
  65. Iron deficiency anemia
  66. Iron overload, also known asHemochromatosis)
  67. Irritable bowel syndrome
  68. Ischemia, intestinal, also known asIntestinal ischemia)
  69. Ischemic bone necrosis, also known asAvascular necrosis)
  70. Ischemic colitis
  71. Ischemic priapism, also known asPriapism)
  72. Islet cell cancer, also known asPancreatic neuroendocrine tumors)
  73. Itchy skin (pruritus)
  74. ITP, also known asImmune thrombocytopenia (ITP))
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