1. Lactase deficiency, also known asLactose intolerance)
  2. Lactation mastitis, also known asMastitis)
  3. Lactose intolerance
  4. Laryngitis
  5. Lassa fever, also known asViral hemorrhagic fevers)
  6. Lateral elbow tendinopathy, also known asTennis elbow)
  7. Lateral epicondylitis, also known asTennis elbow)
  8. Lateral epicondylosis, also known asTennis elbow)
  9. Latex allergy
  10. Lazy eye (amblyopia)
  11. LCIS, also known asLobular carcinoma in situ (LCIS))
  12. Lead poisoning
  13. Left ventricular hypertrophy
  14. Leg fracture, also known asBroken leg)
  15. Legg-Calve-Perthes disease
  16. Legionellosis, also known asLegionnaires' disease)
  17. Legionnaires' disease
  18. Leiomyosarcoma
  19. Lentigines, solar, also known asAge spots (liver spots))
  20. Leukemia
  21. Leukemia, acute lymphocytic, also known asAcute lymphocytic leukemia)
  22. Leukemia, acute myelogenous, also known asAcute myelogenous leukemia)
  23. Leukemia, chronic lymphocytic, also known asChronic lymphocytic leukemia)
  24. Leukemia, chronic myelogenous, also known asChronic myelogenous leukemia)
  25. Leukemia, general, also known asLeukemia)
  26. Leukemia, hairy cell, also known asHairy cell leukemia)
  27. Leukoplakia
  28. Lewy body dementia
  29. Lice
  30. Lice, body, also known asBody lice)
  31. Lichen nitidus
  32. Lichen planus
  33. Lichen planus, oral, also known asOral lichen planus)
  34. Lichen sclerosus
  35. Lichen simplex chronicus, also known asNeurodermatitis)
  36. Lip cancer
  37. Lip cancer, also known asMouth cancer)
  38. Lipodystrophy, intestinal, also known asWhipple's disease)
  39. Lipoma
  40. Liposarcoma
  41. Listeria infection
  42. Listeriosis, also known asListeria infection)
  43. Liver cancer
  44. Liver disease
  45. Liver failure, acute, also known asAcute liver failure)
  46. Liver hemangioma
  47. Liver spots, also known asAge spots (liver spots))
  48. Liver, enlarged, also known asEnlarged liver)
  49. Lobular carcinoma in situ (LCIS)
  50. Localized scleroderma, also known asMorphea)
  51. Lockjaw, also known asTetanus)
  52. Long QT syndrome
  53. Loss of bladder control, also known asUrinary incontinence)
  54. Lou Gehrig's disease, also known asAmyotrophic lateral sclerosis (ALS))
  55. Low blood pressure (hypotension)
  56. Low blood sugar, also known asHypoglycemia)
  57. Low body temperature, also known asHypothermia)
  58. Low platelet count, also known asThrombocytopenia)
  59. Low sex drive in women
  60. Low sperm count
  61. Low testosterone, also known asMale hypogonadism)
  62. Low-flow priapism, also known asPriapism)
  63. Lung cancer
  64. Lung collapse, also known asPneumothorax)
  65. Lung collapse, also known asAtelectasis)
  66. Lung disease, interstitial, also known asInterstitial lung disease)
  67. Lupus
  68. Lupus nephritis
  69. Lyme disease
  70. Lymph nodes, swollen, also known asSwollen lymph nodes)
  71. Lymphadenitis, also known asSwollen lymph nodes)
  72. Lymphadenitis, mesenteric, also known asMesenteric lymphadenitis)
  73. Lymphedema
  74. Lymphoma
  75. Lymphoma, Hodgkin's, also known asHodgkin's lymphoma (Hodgkin's disease))
  76. Lymphoma, non-Hodgkin's, also known asNon-Hodgkin's lymphoma)
  77. Lymphoplasmacytic lymphoma, also known asWaldenstrom macroglobulinemia)
  78. Lynch syndrome
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