China 
Africa 
- Inferior medullary velum
- Inferior mesenteric artery
- Inferior mesenteric vein
- Inferior myocardial infarction
- Inferior nasal concha
- Inferior oblique muscle
- Inferior olivary nucleus
- Inferior ophthalmic vein
- Inferior orbital fissure
- Inferior parietal lobule
- Inferior petrosal sinus
- Inferior petrosal sinus sampling
- Inferior phrenic arteries
- Inferior phrenic artery
- Inferior phrenic vein
- Inferior phrenic veins
- Inferior rectus muscle
- Inferior sagittal sinus
- Inferior temporal cortex
- Inferior temporal gyrus
- Inferior thyroid artery
- Inferior thyroid veins
- Inferior tibiofibular joint
- Inferior vena cava
- Inferior vena cava filter
- Inferior vesical artery
- Inferiority complex
- Infertility
- Infestation
- Infiltration
- Infiltrative ophthalmopathy
- Inflammaging
- Inflammasome
- Inflammation
- Inflammatory arthritis
- Inflammatory bowel disease
- Inflammatory breast cancer
- Inflammatory cell
- Inflammatory cytokines
- Inflammatory diseases
- Inflammatory disorder
- Inflammatory linear verrucous epidermal nevus
- Inflammatory mediators
- Inflammatory myofibroblastic tumor
- Inflammatory myofibroblastic tumour
- Inflammatory myopathy
- Inflammatory pseudotumor
- Inflammatory reflex
- Inflammatory response
- Infliximab
- Influenza
- Influenza A
- Influenza A virus
- Influenza B
- Influenza C virus
- Influenza vaccine
- Influenza virus
- Influenza-like illness
- Infodemiology
- Informant Questionnaire on Cognitive Decline in the Elderly
- Information bias
- Information cascades
- Information processing
- Informed assent
- Informed consent
- Informed refusal
- Infraclavicular fossa
- Infracyanine green
- Infrahyoid muscle
- Infralimbic cortex
- Inframammary fold
- Infraorbital artery
- Infraorbital canal
- Infraorbital foramen
- Infraorbital groove
- Infraorbital margin
- Infraorbital nerve
- Infrapatellar fat pad
- Infrared detectors
- Infrared imaging
- Infrared laser
- Infrared radiation
- Infrared sauna
- Infraspinatus
- Infraspinatus muscle
- Infraspinous fossa
- Infratemporal fossa
- Infratemporal space
- Infratentorial region
- Infratrochlear nerve
- Infundibulum
- Infusion
- Infusion pump
- Infusion set
- Infusion therapy
- Ingenol mebutate
- Ingestion
- Ingestive behaviors
- Ingression
- Ingrown nail
- Ingrown toenails
- Inguinal canal
- Inguinal hernia
- Inguinal ligament
- Inguinal lymph node
- Inguinal lymphadenopathy
- Inguinal orchiectomy
- Inguinal region
- Inguinofemoral lymphadenectomy
- Inhalable insulin
- Inhalant abuse
- Inhalants
- Inhalation
- Inhalation exposure
- Inhalational anesthetics
- Inhalational anthrax
- Inhalers
- Inheritance
- Inhibin
- Inhibin B
- Inhibition
- Inhibitor of DNA-binding protein
- Inhibitor protein
- Inhibitors
- Inhibitory control
- Inhibitory postsynaptic potential
- Iniencephaly
- Inion
- Initial volume of distribution
- Initiation factors
- Injection port
- Injection site pain
- Injection site reaction
- Injections
- Injector pen
- Injury prevention
- Ink blot test
- Innate immune cells
- Innate immune responses
- Innate immune system
- Innate immunity
- Innate lymphoid cells
- Inner cell mass
- Inner critic
- Inner ear
- Inner enamel epithelium
- Inner hair cells
- Inner limiting membrane
- Inner membrane
- Inner mitochondrial membrane