idiopathic infantile hypercalcemia

idiopathic pulmonary fibrosis

immune rejection

impotence

incontinence

infantile amnesia

infarct

infectious diseases

inflammation

inflammatory bowel disease

influenza

inherited intellectual disability

insomnia

interstitial lung disease

involuntary movement disorder

iron deficiency

irregular heart rhythms

irritable bowel syndrome

ischemic heart disease

ischemic stroke