| 1. | Dacryocystitis (1 study) |
| 2. | Deafness (5 studies) |
| 3. | Death (30 studies) |
| 4. | Death, Sudden (28 studies) |
| 5. | Death, Sudden, Cardiac (22 studies) |
| 6. | Decubitus Ulcer (4 studies) |
| 7. | Deficiency Diseases (18 studies) |
| 8. | Deglutition Disorders (11 studies) |
| 9. | Delirium (129 studies) |
| 10. | Deltaretrovirus Infections (21 studies) |
| 11. | Delusions (4 studies) |
| 12. | Dementia (139 studies) |
| 13. | Dementia, Vascular (2 studies) |
| 14. | Demyelinating Autoimmune Diseases, CNS (44 studies) |
| 15. | Demyelinating Diseases (64 studies) |
| 16. | Dengue (3 studies) |
| 17. | Dengue Hemorrhagic Fever (2 studies) |
| 18. | Dental Caries (292 studies) |
| 19. | Dental Deposits (1 study) |
| 20. | Dental Plaque (1 study) |
| 21. | Depersonalization (1 study) |
| 22. | Depression (245 studies) |
| 23. | Depression, Involutional (57 studies) |
| 24. | Depression, Postpartum (7 studies) |
| 25. | Depressive Disorder (242 studies) |
| 26. | Dermatitis (4 studies) |
| 27. | Dermatitis, Atopic (2 studies) |
| 28. | Dermatitis, Exfoliative (2 studies) |
| 29. | Dermatofibroma (38 studies) |
| 30. | Dermatomycoses (5 studies) |
| 31. | Dermatomyositis (12 studies) |
| 32. | Dermoid Cyst (14 studies) |
| 33. | Developmental Disabilities (22 studies) |
| 34. | Dextrocardia (1 study) |
| 35. | Diabetes Insipidus (3 studies) |
| 36. | Diabetes Insipidus, Nephrogenic (1 study) |
| 37. | Diabetes Insipidus, Neurogenic (3 studies) |
| 38. | Diabetes Mellitus (270 studies) |
| 39. | Diabetes Mellitus, Experimental (1 study) |
| 40. | Diabetes Mellitus, Lipoatrophic (1 study) |
| 41. | Diabetes Mellitus, Type I (36 studies) |
| 42. | Diabetes Mellitus, Type II (270 studies) |
| 43. | Diabetes, Gestational (2 studies) |
| 44. | Diabetic Angiopathies (24 studies) |
| 45. | Diabetic Foot (8 studies) |
| 46. | Diabetic Lumbosacral Radiculoplexus Neuropathy (1 study) |
| 47. | Diabetic Nephropathies (7 studies) |
| 48. | Diabetic Neuropathies (20 studies) |
| 49. | Diabetic Retinopathy (20 studies) |
| 50. | Diarrhea (33 studies) |
| 51. | Diffuse Cerebral Sclerosis of Schilder (1 study) |
| 52. | DiGeorge Syndrome (4 studies) |
| 53. | Digestive System Abnormalities (4 studies) |
| 54. | Digestive System Diseases (1069 studies) |
| 55. | Digestive System Neoplasms (771 studies) |
| 56. | Dilatation, Pathologic (2 studies) |
| 57. | Diphtheria (4 studies) |
| 58. | Disorders of Environmental Origin (468 studies) |
| 59. | Disorders of Excessive Somnolence (6 studies) |
| 60. | DNA Damage (1 study) |
| 61. | DNA Virus Infections (304 studies) |
| 62. | Down Syndrome (4 studies) |
| 63. | Drinking Behavior (2 studies) |
| 64. | Drug Toxicity (63 studies) |
| 65. | Dry Eye Syndromes (11 studies) |
| 66. | Ductus Arteriosus, Patent (3 studies) |
| 67. | Duodenal Diseases (20 studies) |
| 68. | Duodenal Neoplasms (20 studies) |
| 69. | Dupuytren's Contracture (2 studies) |
| 70. | Dwarfism (10 studies) |
| 71. | Dysarthria (2 studies) |
| 72. | Dysgammaglobulinemia (1 study) |
| 73. | Dysgerminoma (1 study) |
| 74. | Dyskeratosis Congenita (2 studies) |
| 75. | Dyskinesia, Drug-Induced (2 studies) |
| 76. | Dyskinesias (30 studies) |
| 77. | Dyslexia (5 studies) |
| 78. | Dyslexia, Acquired (1 study) |
| 79. | Dysmenorrhea (2 studies) |
| 80. | Dysmorphic Syndromes (71 studies) |
| 81. | Dysostoses (3 studies) |
| 82. | Dyspnea (5 studies) |
| 83. | Dyssomnias (53 studies) |
| 84. | Dysthymic Disorder (3 studies) |
| 85. | Dystonia (18 studies) |
| 86. | Dystonic Disorders (18 studies) |
