I
- IBC
- IBD
- IBS
- IC
- Ichthyosis
- Icterohemorrhagic fever
- Ideomotor apraxia
- Idiopathic autonomic failure
- Idiopathic hypertension
- Idiopathic hypertrophic subaortic stenosis - adult
- Idiopathic hypertrophic subaortic stenosis - child
- Idiopathic inflammatory myopathy
- Idiopathic orthostatic hypertension
- Idiopathic polyneuritis
- Idiopathic pulmonary arterial hypertension
- Idiopathic pulmonary fibrosis
- Idiopathic pulmonary hypertension
- Idiopathic thrombocytopenic purpura
- IgA nephropathy
- Ileitis
- Ileus
- Iliotibial band friction syndrome
- Immune thrombocytopenic purpura
- Immunoglobin A nephropathy
- Impacted tooth
- Imperforate anus
- Impetigo
- Impotence
- Inappropriate lactation
- Incisional hernia
- Incontinence, functional, female
- Incontinence, functional--male
- Incontinence, neurogenic - child
- Incontinence, overflow, female
- Incontinence, overflow--male
- Incontinence, stress, female
- Incontinence, stress--male
- Incontinence, urge, female
- Incontinence, urge--male
- Incontinence, urinary, female
- Incontinence, urinary--male
- Indigestion
- Infantile hemangioma
- Infantile hypertrophic pyloric stenosis
- Infected tear duct
- Infection, kidney
- Infectious arthritis
- Infertility
- Inflammation of the optic nerve
- Inflammation of the pancreas
- Inflammatory bowel disease
- Inflammatory Bowel Disease
- Inflammatory breast cancer
- Inflammatory breast carcinoma
- Inflammatory carcinoma of the breast
- Influenza
- Influenza A (H1N1)
- Infrapatellar tendinopathy
- Ingrown toenail
- Inguinal hernia - adult
- Inguinal hernia - child
- Inherited metabolic diseases - overview
- Injury, central cord
- Insect allergy
- Insect bites and stings
- Insomnia
- Insulin-resistant diabetes
- Insulin dependent diabetes
- Intellectual disability
- Interdigital neuroma
- Intermetatarsal neuroma
- Internal carotid artery stenosis
- Internal prolapse
- Interrupted aortic arch - child
- Interstitial cystitis
- Intestinal flu
- Intestinal lipodystrophy
- Intestinal neurosis
- Intestinal pseudo-obstruction
- Intracerebral aneurysm
- Intracranial aneurysm
- Intraperitoneal transfusion
- Intrauterine fetal death
- Intrauterine transfusion
- Intussusception
- Ionizing radiation exposure
- Ipsilateral fractures of the clavicle and scapular neck
- IPT
- Iridocyclitis
- Iritis
- Iron-deficiency anemia
- Iron-poor blood
- Irritable bowel syndrome
- Irritable colon
- Ischemic bowel disease
- Ischemic colitis
- Ischemic heart disease
- Ischemic necrosis
- ITP
- IUFD
- IUT