Dandruff
De Quervain's tenosynovitis
Deep folliculitis
Deep vein thrombosis (DVT)
Dehydration
Delayed ejaculation
Delirium
Dengue fever
Depersonalization disorder
Depression (major depression)
Dermatitis herpetiformis
Dermatographia
Dermatomyositis
Deviated septum
Diabetes
Diabetes insipidus
Diabetic coma
Diabetic hyperosmolar syndrome
Diabetic hypoglycemia
Diabetic ketoacidosis
Diabetic retinopathy
Diaper rash
Diffuse idiopathic skeletal hyperostosis (DISH)
DiGeorge syndrome
Dilated cardiomyopathy
Diphtheria
Dislocated elbow
Dislocated shoulder
Dislocation
Disorganized schizophrenia
Disseminated coccidioidomycosis
Dissociative amnesia
Dissociative fugue
Dissociative identity disorder
distended abdomen
Diverticulitis
Double uterus
Down syndrome
Dressler's syndrome
Drug addiction
Drug allergy
Dry eyes
Dry macular degeneration
Dry mouth
Dry skin
Dry socket
Ductal carcinoma in situ (DCIS)
Dumping syndrome
Dupuytren's contracture
Dust mite allergy
Dwarfism
Dyshidrosis
Dyslexia
Dystonia