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