- Hair Loss
- Hand-Foot-Mouth Disease
- Hashimotos Disease
- Head & Neck Cancer see Mouth Cancer ; Throat Cancer
- Head Lice
- Headaches
- Hearing Disorders
- Hearing Loss
- Heart Attack
- Heart Defects see Congenital Heart Disease
- Heart Disease : Congenital
- Heart Failure, Congestive see Congestive Heart Failure
- Heartburn see Acid Reflux
- Heat Exhaustion
- Heat Rash
- Heat Stroke
- Helicobacter Pylori Infections see Stomach Ulcers
- Hemangioma
- Hematology
- Hemochromatosis
- Hemophilia
- Hemorrhagic Fevers see Ebola
- Hemorrhoids
- Hepatitis
- Hepatitis C
- Hepatolenticular Degeneration see Wilsons Disease
- Herbal Medicine
- Herniated Disc
- Herpes Infections
- Herpes, Neonatal see Neonatal Herpes
- Herpes, Ocular see Keratitis
- Herpes Simplex
- Herpes Zoster : Ear | Eye
- Hiatal Hernia
- High Blood Pressure
- HIV / AIDS Symptoms
- HIV see AIDS
- HIV & Eye Diseases
- HIV & Oral Diseases
- HIV & Skin Diseases
- Hives
- Hodgkin's Disease
- Hormones see Endocrine System
- Hot Flashes
- Hot Tub Rash
- HPV
- Human Genome Project see Gene Therapy
- Human Heart Pictures
- Human Immunodeficiency Virus see AIDS
- Human Papillomavirus see HPV
- Huntington's Disease
- Hygiene hypothesis
- Hypertension see High Blood Pressure
- Hyperthermia see Heat Stroke
- Hyperthyroidism see Graves Disease
- Hypoglycemia
- Hypothyroidism
- Hysterectomy