- Idiopathic Thrombocytopenia Purpura
- Ileus
- Immobilization
- Immune System Development
- Immunodeficiency
- Immunoglobulin Deficiency Syndromes
- Impetigo
- Impulse Control Disorders
- Inclusion Conjunctivitis
- Infant Massage
- Infant Mortality
- Infectious Mononucleosis
- Influenza
- Insect Sting Allergy
- Intelligence
- Intermittent Explosive Disorder
- Intersex States
- Intestinal Obstructions
- Intrauterine Growth Retardation
- Intravenous Rehydration
- Iron Deficiency Anemia
- Irritable Bowel Syndrome
- Itching
