- IBS see Irritable Bowel Syndrome
- Icterus see Jaundice
- ICU see Critical Care
- Identifying health misinformation see Evaluating Health Information
- Ileostomy see Ostomy
- Immune System and Disorders
- Immunization, Childhood see Childhood Vaccines
- Impacted Tooth see Tooth Disorders
- Impaired Driving
- Impetigo
- Implantable Defibrillators see Pacemakers and Implantable Defibrillators
- Impotence see Erectile Dysfunction
- In Vitro Fertilization see Assisted Reproductive Technology
- In-home Care see Home Care Services
- Incontinence see Urinary Incontinence
- Indigestion
- Indoor Air Pollution
- Infant and Newborn Care
- Infant and Newborn Development
- Infant and Newborn Nutrition
- Infantile Paralysis see Polio and Post-Polio Syndrome
- Infection Control
- Infections and Pregnancy
- Infections, Bacterial see Bacterial Infections
- Infections, Bladder see Urinary Tract Infections
- Infections, Fungal see Fungal Infections
- Infections, Viral see Viral Infections
- Infectious Arthritis
- Infectious Diseases
- Infectious Mononucleosis
- Infertility
- Infertility, Female see Female Infertility
- Infertility, Male see Male Infertility
- Inflammatory Bowel Disease see Crohn's Disease; Ulcerative Colitis
- Influenza see Flu
- Influenza Vaccine see Flu Shot
- Informed Consent see Patient Rights
- Ingrown Nail see Nail Diseases
- Inguinal Hernia see Hernia
- Inhalants
- Inhalation Injuries
- Injuries see Wounds and Injuries
- Insect Bites and Stings
- Insect Repellents see Insect Bites and Stings
- Insecticides see Pesticides
- Insomnia
- Insulin see Diabetes Medicines
- Insulin Resistance see Metabolic Syndrome; Prediabetes
- Insulin-Dependent Diabetes Mellitus see Diabetes Type 1
- Insurance see Health Insurance; Managed Care; Medicaid; Medicare
- Integrative Medicine see Complementary and Integrative Medicine
- Intermittent Claudication see Leg Injuries and Disorders; Peripheral Arterial Disease
- International health see Global Health
- Interstitial Cystitis
- Interstitial Lung Diseases
- Interstitial Pneumonitis see Interstitial Lung Diseases
- Intestinal Cancer
- Intestinal Diseases see Colonic Diseases; Small Intestine Disorders
- Intestinal Obstruction
- Intestinal Volvulus see Intestinal Obstruction
- Intimate Partner Violence
- Intracranial Aneurysm see Brain Aneurysm
- Intraocular Lens see Cataract; Refractive Errors
- Intraocular Melanoma see Eye Cancer; Melanoma
- Intussusception see Intestinal Obstruction
- Iron
- Iron Deficiency Anemia see Anemia
- Iron Overload Disease see Hemochromatosis
- Irregular Heartbeat see Arrhythmia
- Irritable Bowel Syndrome
- Ischemic Stroke
- Islet Cell Carcinoma see Pancreatic Cancer
- Islet Cell Transplantation
- Itching
- IUD see Birth Control
- IVF see Assisted Reproductive Technology
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