Diagnosaurus
- Facial erythema
- Facial pain
- Facial palsy
- Failure to thrive
- Falls & gait disorders
- Fatigue
- Fatigue and weight loss
- Fecal incontinence
- Fecal occult blood test, positive
- Fever
- Fever, hospital-acquired
- Fever, postoperative
- Fever, postpartum
- Fever, relapsing or recurrent
- Fever and cough
- Fever and fatigue
- Fever and joint pain
- Fever and nausea
- Fever and peripheral neuropathy
- Fever and rash
- Fever and shortness of breath
- Fever in immunocompromised
- Fever in parenteral drug user
- Fever in returning traveler
- Fever of unknown origin
- Fibrillation, ventricular
- Figurate (shaped) erythemas
- Fistula, perianal
- Flatfoot
- Flatus (flatulence)
- Floaters
- Foot drop
- Foot pain
- Fracture, pathologic
- Frequency, urinary
- Fulminant hepatic failure
- FUO
- FUO in HIV/AIDS