- Dandy Fever (Dengue Fever) (Breakbone Fever)
- de Lange Syndrome
- De Quervain's Tenosynovitis
- Deafness (Hearing Loss) (Loss of Hearing)
- Deep Vein Thrombosis (DVT) (Economy Class Syndrome)
- Defensin (Human Neutrophil Peptide) (HNP)
- Defibrillator Storm
- DEHP (di(2-ethylhexyl)phthalate) (Plasticizer)
- Dehydration
- Déjà vu (Paramnesia), Déjà vécu, Déjà senti, Déjà visité
- Delirium, Delirium Tremens (DTs)
- Delusional Jealousy (Othello Syndrome)
- Dementia
- Demonophobia (Fear of Demons)
- Dengue (Breakbone Fever) (Dandy Fever)
- Dental Amalgam Mercury Poisoning
- Dental Cavities (Dental Caries)
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- Dependent Edema
- Depression and Bipolar Disorder, Nutritional Considerations
- Dercums Disease (Adiposis Dolorosa) (Morbus Dercum)
- Dermatology
- Detoxification
- Developmental Dislocation of the Hip
- Developmental-Behavioral Pediatrics
- DHEA (a.k.a. dehydroepiandrosterone)
- Dialectical Behavioral Therapy
- Dialysis, Kidney Dialysis, Peritoneal Dialysis, Dialysis Machine
- Diaper Rash, Yeast Diaper Rash
- Diaphragm Pacing
- Diaphragmatic Hernias
- Diastrophic Dysplasia
- Diesel Exhaust
- Diesel Exhaust Particles, Diesel Exhaust
- Diet Therapy
- Diethylstilbesterol (DES)
- Diethylstilbestrol (DES)
- Differentiation Therapy
- Diffuse Idiopathic Skeletal Hyperostosis
- Diffuse Toxic Goiter (Grave's Disease)
- Digestive Insufficiency
- Dihydrotestosterone (DHT)
- Dilated Cardiomyopathy
- Dioxin
- Dipsophobia
- Diptheria
- Discoid Lupus
- Dissecting Aneurysm
- Dissociation, Dissociative Amnesia
- Distilled Water versus Mineral, Carbon Filtered, and Reverse Osmosis Water
- Diuretic Therapy
- Diuretics
- Divertidulosis, Divertidulitis
- DMPS in Medicine
- DMSO (a.k.a. dimethylsulfoxide)
- DNA (Deoxyribonucleic Acid)
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- Dysuria (Burning on Urination)
- Early Breast Development (Thelarche)
- Eicosanoid Balance and Essential Fatty Acids
- Electron Beam CT Scan (Heart Scan) (Ultrafast CT) [computerized tomography]
- Elevated Blood Suger (High Blood Sugar) (Hyperglycemia)
- Emergency Medicine
- Emotions and Health
- Endocrinology
- Endodontics
- Energy Medicine
- Energy Medicine in the Treatment of Cancer
- Enhanced External Counter Pulsation (EECP)
- Enterococcus
- Environmental Medicine
- Enzyme Nutrition
- Enzyme Potentiated Desensitization (EPD)
- Enzyme Therapy
- Epstein-Barr Virus (Mononucleosis) (Mono) (Kissing Disease)
- Equinophobia (Hippophobia) (Fear of Horses)
- Equol
- Erb Palsy (Duchenne-Erb Palsy) (Duchenne-Erb Paralysis) (Erb Paralysis) (Erb's Palsy)
- Erdheim Chester Disease
- Erectile Dysfunction
- Ergophobia (Fear of Work)
- Ergot
- Erotic Jealousy Syndrome (a.k.a. Othello Syndrome, Delusional Jealousy, Morbid Jealousy, and Sexual Jealousy)
- Erotomania
- Eruptive Xanthoma
- Erythema Infectiosum (Fifth disease)
- Erythema Multiforme (Stevens-Johnson syndrome)
- Erythema Nodosum
- Erythrasma