1. Lactase deficiency (See: Lactose intolerance)
  2. Lactation mastitis (See: Mastitis)
  3. Lactose intolerance
  4. Laryngitis
  5. Lassa fever (See: Viral hemorrhagic fevers)
  6. Lateral epicondylitis (See: Tennis elbow)
  7. Latex allergy
  8. Lazy eye (amblyopia)
  9. LCIS (See: Lobular carcinoma in situ (LCIS))
  10. Lead poisoning
  11. Left ventricular hypertrophy
  12. Leg fracture (See: Broken leg)
  13. Legg-Calve-Perthes disease
  14. Legionellosis (See: Legionnaires' disease)
  15. Legionnaires' disease
  16. Leiomyosarcoma
  17. Lentigines, solar (See: Age spots (liver spots))
  18. Leukemia
  19. Leukemia, acute lymphocytic (childhood leukemia) (See: Acute lymphocytic leukemia)
  20. Leukemia, acute myelogenous (See: Acute myelogenous leukemia)
  21. Leukemia, chronic lymphocytic (See: Chronic lymphocytic leukemia)
  22. Leukemia, chronic myelogenous (See: Chronic myelogenous leukemia)
  23. Leukemia, general (See: Leukemia)
  24. Leukemia, hairy cell (See: Hairy cell leukemia)
  25. Leukoplakia
  26. Lewy body dementia
  27. Lice
  28. Lice, body (See: Body lice)
  29. Lichen nitidus
  30. Lichen planus
  31. Lichen planus, oral (See: Oral lichen planus)
  32. Lichen sclerosus
  33. Lichen simplex chronicus (See: Neurodermatitis)
  34. Limited scleroderma
  35. Lip cancer (See: Mouth cancer)
  36. Lip cancer
  37. Lipodystrophy, intestinal (See: Whipple's disease)
  38. Lipoma
  39. Liposarcoma
  40. Listeria infection
  41. Listeriosis (See: Listeria infection)
  42. Lithiasis, renal (See: Kidney stones)
  43. Liver cancer
  44. Liver disease
  45. Liver failure, acute (See: Acute liver failure)
  46. Liver hemangioma
  47. Liver spots (See: Age spots (liver spots))
  48. Liver, enlarged (See: Enlarged liver)
  49. Lobular carcinoma in situ (LCIS)
  50. Lockjaw due to tetanus infection (See: Tetanus)
  51. Long QT syndrome
  52. Lou Gehrig's disease (See: Amyotrophic lateral sclerosis (ALS))
  53. Low blood pressure (hypotension)
  54. Low blood sugar (See: Hypoglycemia)
  55. Low body temperature (See: Hypothermia)
  56. Low sex drive in women
  57. Low sperm count
  58. Low testosterone (See: Male hypogonadism)
  59. Low-flow priapism (See: Priapism)
  60. Lung cancer
  61. Lung collapse (See: Atelectasis)
  62. Lung collapse (See: Pneumothorax)
  63. Lung disease, interstitial (See: Interstitial lung disease)
  64. Lupus
  65. Lupus nephritis
  66. Lyme disease
  67. Lymph nodes, swollen (See: Swollen lymph nodes)
  68. Lymphadenitis (See: Swollen lymph nodes)
  69. Lymphadenitis, mesenteric (See: Mesenteric lymphadenitis)
  70. Lymphedema
  71. Lymphocytic colitis (See: Microscopic colitis)
  72. Lymphoma
  73. Lymphoma, Hodgkin's (See: Hodgkin's lymphoma (Hodgkin's disease))
  74. Lymphoma, non-Hodgkin's (See: Non-Hodgkin's lymphoma)
  75. Lynch syndrome
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