See Conditions by First Letter (I)
- I Cell Disease
- Iatrogenic Disease
- IBIDS Syndrome
- Ichthyosiform Erythroderma, Congenital
- Ichthyosis
- Ichthyosis Linearis Circumflexa
- Ichthyosis Vulgaris
- Ichthyosis, Lamellar
- Ichthyosis, X-Linked
- Idiopathic Adolescent Scoliosis
- Idiopathic Interstitial Pneumonias
- Idiopathic Myopathy
- Idiopathic Pulmonary Fibrosis
- Idiopathic Pulmonary Hemosiderosis
- Idiopathic Pulmonary Hypertension
- Idiopathic Thrombocytopenic Purpura
- IgA Deficiency
- IgG Deficiency
- Ileal Diseases
- Ileal Neoplasms
- Ileitis
- Ileus
- Iliac Aneurysm
- Iliotibial Band Syndrome
- Illusions
- Immune Reconstitution Inflammatory Syndrome
- Immune Thrombocytopenia
- Immunoblastic Lymphadenopathy
- Immunodeficiency With Hyper IgM Type 1
- Immunologic Deficiency Syndromes
- Immunoproliferative Disorders
- Impetigo
- Impulse Control Disorders
- Impulsive Behavior
- Inappropriate ADH Syndrome
- Inborn Amino Acid Metabolism Disorder
- Inclusion Body Myopathy 2
- Inclusion Body Myositis
- Inclusion Conjunctivitis
- Incontinentia Pigmenti
- Indolent B Cell Lymphoma
- Infant Nutrition Disorders
- Infant, Newborn, Diseases
- Infant, Premature, Diseases
- Infantile Apnea
- Infantile Scoliosis
- Infantile-onset Ascending Hereditary Spastic Paralysis
- Infarction
- Infarction, Middle Cerebral Artery
- Infarction, Posterior Cerebral Artery
- Infectious Arthritis
- Infectious Mononucleosis
- Infective Endocarditis
- Inferior Wall Myocardial Infarction
- Infertility
- Infertility, Female
- Infertility, Male
- Inflammation
- Inflammatory Bowel Diseases
- Inflammatory Breast Cancer
- Inflammatory Breast Neoplasms
- Inflammatory Myofibroblastic Tumor
- Influenza in Birds
- Influenza, Human
- Infratentorial Neoplasms
- Insect Bites and Stings
- Insulin Resistance
- Insulin-like Growth Factor I Deficiency
- Insulinoma
- Intermittent Claudication
- Intertrigo
- Intervertebral Disk Degeneration
- Intervertebral Disk Displacement
- Intestinal Atresia
- Intestinal Diseases
- Intestinal Diseases, Parasitic
- Intestinal Fistula
- Intestinal Neoplasms
- Intestinal Obstruction
- Intestinal Perforation
- Intestinal Polyposis
- Intestinal Polyps
- Intestinal Pseudo-Obstruction
- Intestinal Volvulus
- Intra-Articular Fractures
- Intracranial Aneurysm
- Intracranial Arterial Diseases
- Intracranial Arteriosclerosis
- Intracranial Arteriovenous Malformations
- Intracranial Embolism
- Intracranial Embolism and Thrombosis
- Intracranial Hemorrhage, Hypertensive
- Intracranial Hemorrhage, Traumatic
- Intracranial Hemorrhages
- Intracranial Hypertension
- Intracranial Hypotension
- Intracranial Thrombosis
- Intrahepatic Cholangiocarcinoma
- Intrahepatic Cholestasis of Pregnancy
- Intraocular Melanoma
- Intraoperative Awareness
- Intraoperative Complications
- Intrauterine Infections
- Intravenous Leiomyomatosis
- Intussusception
- Invasive Pulmonary Aspergillosis
- Iridocorneal Endothelial Syndrome
- Iridocyclitis
- Iris Neoplasms
- Iritis
- Iron Metabolism Disorders
- Iron Overload
- Irritable Bowel Syndrome
- Isaacs Syndrome
- Ischemia
- Ischemic Attack, Transient
- Isolated ACTH Deficiency
- Isolated Noncompaction of the Ventricular Myocardium