F
- Facial hair, excess in women
- Facial palsy
- Factitious disorder
- Factor V Leiden
- Fallen arches
- Fallot, tetralogy of
- Familial adenomatous polyposis
- Familial hypercholesterolemia
- Familial Mediterranean fever
- Familial paroxysmal peritonitis
- FAP
- Farsightedness
- Fatty liver disease (MASLD)
- FDIS
- Febrile seizure
- FEC
- Fecal incontinence
- FECD
- Female infertility
- Female sexual dysfunction
- Fetal alcohol syndrome
- Fetal macrosomia
- Fever
- Fever blister
- Fever, valley
- Fevers, viral hemorrhagic
- FH
- Fibroadenoma
- Fibrocystic breasts
- Fibroids, uterine
- Fibromuscular dysplasia
- Fibromyalgia
- Fibromyalgia syndrome
- Fibrosis, interstitial pulmonary
- Fibrosis, pulmonary
- Fifth disease
- Filoviruses
- Fistula, arteriovenous
- Flatfeet
- Flatulence
- Flaviviruses
- Floaters
- Floor of the mouth cancer
- Floppy valve syndrome
- Flu
- Flu, avian
- Flu, bird
- Flu, swine
- Fluid around the heart
- FM
- FMS
- FND
- Focal segmental glomerulosclerosis (FSGS)
- Folate deficiency anemia
- Follicular lymphoma
- Folliculitis
- Food allergy
- Food allergy, egg
- Food allergy, milk
- Food poisoning (foodborne illness)
- Food-borne illness
- Foot drop
- Foot fracture
- Foramen ovale
- Fracture, arm
- Fracture, growth plate
- Fracture, hip
- Fracture, leg
- Fracture, stress
- Fractured nose
- Fractured rib
- Frontal lobe epilepsy
- Frontal lobe seizures
- Frontotemporal dementia
- Frontotemporal lobar degeneration
- Frostbite
- Frozen shoulder
- FSGS
- FTD
- Fuchs dystrophy
- Fuchs endothelial corneal dystrophy
- Fuchs endothelial dystrophy
- Functional dyspepsia
- Functional neurologic disorder/conversion disorder
- Functional neurological symptom disorder
- Fungal infection, nail
- Funnel chest