Diagnosaurus
- ICP increased
- Idiopathic pulmonary fibrosis
- Idiopathic thrombocytopenic purpura
- Id reaction
- IgA deficiency, selective
- IgA nephropathy
- Ileus, acute paralytic
- Imbalance
- Immobility (especially in elderly)
- Immunocompromised and fever
- Immunodeficiency, common variable
- Immunodeficiency disorders in adults
- Impetigo
- Impotence
- Incontinence, fecal
- Incontinence, urinary
- Infection in immunocompromised
- Infectious mononucleosis
- Infective endocarditis
- Infertility, female
- Infertility, male
- Inflammatory bowel disease
- Inflammatory bowel disease–associated arthritis
- Influenza
- Insomnia
- Interstitial cystitis
- Interstitial lung disease
- Interstitial nephritis
- Intertriginous rash
- Intertrigo
- Intestinal ischemia, acute
- Intestinal ischemia, chronic
- Intestinal obstruction, large
- Intestinal obstruction, small
- Intracranial pressure, increased
- Intraocular pressure, increased
- Involuntary weight loss
- IPF
- Iritis
- Iron-deficiency anemia
- Iron poisoning
- Irritable bowel syndrome
- Ischemic bowel, acute
- Ischemic bowel, chronic
- Ischemic colitis
- Isoniazid (INH) poisoning
- Isosporiasis
- Itching
- Itching and fever
- ITP
- IV drug user and fever