All Diseases that Start with F (Rare, Deadly, and Many More!)

Welcome to an all-encompassing journey through diseases beginning with the letter ‘F’. In this extensive guide, we’ll explore a variety of illnesses affecting everything from blood, bones, and eyes, to mental health and lungs. We’ll also look at skin conditions, as well as diseases specific to dogs and cats.

From rare and deadly diseases to autoimmune disorders and bacterial infections, get ready for a deep dive into the world of ‘F’ diseases.

Top 100 Diseases that Start with F

Below are the top 100 diseases beginning with the letter ‘F’.

  • Fibromyalgia: Chronic pain and fatigue disorder.
  • Fever: Elevated body temperature, often due to infection.
  • Flu (Influenza): Viral respiratory infection.
  • Frostbite: Skin damage from extreme cold.
  • Fatty Liver Disease: Excess fat in liver cells.
  • Fibrosis: Thickening and scarring of connective tissue.
  • Foot Drop: Difficulty lifting the front part of the foot.
  • Fractures: Breaks in bones.
  • Fungal Infections: Infections caused by fungi.
  • Fibroadenoma: Benign breast tumor.
  • Fasciitis: Inflammation of the fascia tissue.
  • Febrile Seizures: Seizures associated with fever in children.
  • Felty Syndrome: Complication of rheumatoid arthritis.
  • Fetal Alcohol Syndrome: Developmental disorders from alcohol exposure in utero.
  • Fibrocystic Breast Changes: Lumpy or painful breasts.
  • Fibromuscular Dysplasia: Artery narrowing and enlargement.
  • Fibrous Dysplasia: Bone development disorder.
  • Fifth Disease: Mild viral infection in children.
  • Fissured Tongue: Grooves on the tongue’s surface.
  • Flat Feet: Lack of arches in feet.
  • Fluorosis: Damage to teeth/bones from fluoride.
  • Focal Segmental Glomerulosclerosis: Scarring in kidney filters.
  • Folliculitis: Inflamed hair follicles.
  • Food Allergies: Allergic reactions to certain foods.
  • Foot Ulcers: Open sores on the foot.
  • Fragile X Syndrome: Genetic condition causing developmental issues.
  • Friedreich’s Ataxia: An inherited disease affecting nerve and muscle function.
  • Frontal Lobe Epilepsy: Seizures originating in the frontal lobe.
  • Frontotemporal Dementia: Early onset dementia.
  • Frozen Shoulder: Stiffness and pain in the shoulder.
  • Fuchs’ Dystrophy: Eye condition affecting the cornea.
  • Functional Gastrointestinal Disorder: GI issues without structural damage.
  • Fungal Nail Infections: Fungal growth under nails.
  • Furunculosis: Boils on the skin.
  • Fusobacterium Infections: Infections from Fusobacterium bacteria.
  • Fatty Liver Disease, Non-Alcoholic: Liver fat buildup without heavy drinking.
  • Feeding Disorders in Infancy: Eating difficulties in babies.
  • Female Genital Mutilation Complications: Health issues from FGM.
  • Femoral Hernia: Bulge near the groin or thigh.
  • Fetal Growth Restriction: Slowed growth of the fetus.
  • Fibrocartilaginous Embolism: Spinal cord blockage.
  • Fibromyalgia Syndrome: Chronic pain and fatigue.
  • Filariasis: Parasitic infection by thread-like worms.
  • Fish Allergy: Allergic reactions to fish proteins.
  • Fistula: Abnormal connection between organs.
  • Flatulence: Excessive gas in the digestive system.
  • Flea-Borne (Murine) Typhus: Rickettsial disease from fleas.
  • Focal Dystonia: Involuntary muscle contractions.
  • Follicular Lymphoma: Type of non-Hodgkin lymphoma.
  • Food Poisoning: Illness from contaminated food.
  • Foot-and-Mouth Disease: Viral disease in animals.
  • Fordyce Spots: Small, painless spots on the skin.
  • Forestier’s Disease: Stiffness and pain in the spine.
  • Fournier’s Gangrene: Flesh-eating bacterial infection of the genitals.
  • Fracture, Stress: Small crack in a bone.
  • Fragile X-associated Tremor/Ataxia Syndrome (FXTAS): Genetic tremor and balance disorder.
  • Francisella tularensis Infection: Bacterial infection causing tularemia.
  • Freckles: Small, pigmented spots on the skin.
  • Freeman-Sheldon Syndrome: Rare congenital myopathy.
  • Frostnip: Mild form of frostbite.
  • Functional Dyspepsia: Chronic indigestion without cause.
  • Fungal Eye Infections: Eye infections caused by fungi.
  • Furuncle: Deep infection of a hair follicle.
  • Fusarium Infection: Infection from Fusarium fungi.
  • Facet Joint Syndrome: Pain at spinal joints.
  • Failure to Thrive: Inadequate growth in children.
  • Familial Chylomicronemia Syndrome: High levels of chylomicrons in blood.
  • Familial Cold Autoinflammatory Syndrome: Disorder causing fever and rash.
  • Familial Dysautonomia: Genetic nerve disorder.
  • Familial Hypercholesterolemia: High cholesterol levels.
  • Familial Hypocalciuric Hypercalcemia: High calcium, low urinary calcium.
  • Familial Mediterranean Fever: Genetic inflammatory disorder.
  • Familial Tremor: Genetic shaking or trembling.
  • Fanconi Syndrome: Kidney disorder affecting electrolyte balance.
  • Farber’s Disease: Genetic disorder affecting joints and tissues.
  • Farmer’s Lung: Lung disease from inhaling dust.
  • Fast Heart Rate (Tachycardia): Abnormally fast heartbeat.
  • Fatal Familial Insomnia: Rare prion disease.
  • Fatty Acid Metabolism Disorders: Problems breaking down fatty acids.
  • Febrile Neutropenia: Fever with low neutrophil count.
  • Femoral Acetabular Impingement: Hip joint disorder.
  • Femoroacetabular Impingement: Abnormal hip joint bones.
  • Fetal Varicella Syndrome: Congenital varicella infection.
  • Fibroadenoma of Breast: Benign breast tumor.
  • Fibromuscular Dysplasia (FMD): Vessel wall abnormality.
  • Fibrosarcoma: Malignant tumor in fibrous tissue.
  • Fibrous Plaque of Penis: Scar tissue causing a curved erection.
  • Fiedler’s Myocarditis: Rare inflammatory heart disease.
  • Fifth Metatarsal Fracture: Break in foot bone.
  • Filarial Worm: Parasitic roundworm infection.
  • Finger Felon: Deep infection of the fingertip.
  • Fissured Tooth: Tooth with cracks.
  • Fistula-In-Ano: Abnormal anal canal connection.
  • Flail Chest: Multiple broken ribs.
  • Flank Pain: Pain in the side of the body.
  • Flat Head Syndrome (Plagiocephaly): Misshapen head in infants.
  • Flexor Tendon Injury: Injury to finger bending tendons.
  • Floating Kidney (Nephroptosis): Downward displacement of the kidney.
  • Floppy Eyelid Syndrome: Easily everted eyelids.
  • Fluoride Poisoning: Excess fluoride consumption.

Also, Check:

Medical Terms That Start With F

Fitness Words That Start With F

Rare Diseases That Start With F

  • Fabry Disease
  • Fahr’s Syndrome
  • Familial Adenomatous Polyposis
  • Familial Mediterranean Fever
  • Fanconi Anemia
  • Farber’s Disease
  • Felty’s Syndrome
  • Fibrodysplasia Ossificans Progressiva
  • Fibromuscular Dysplasia
  • Fibrosing Mediastinitis
  • Fiedler’s Myocarditis
  • Floating-Harbor Syndrome
  • Foix-Alajouanine Syndrome
  • Fragile X Syndrome
  • Fraser Syndrome

Deadly Diseases That Start With F

  • Fatal Familial Insomnia
  • Feline Leukemia Virus (in cats)
  • Fibrolamellar Hepatocellular Carcinoma
  • Fifth Disease
  • Filariasis
  • Flesh-Eating Bacterial Infection
  • Foodborne Illnesses
  • Foot and Mouth Disease
  • Fournier’s Gangrene
  • Fragile X-associated Tremor/Ataxia Syndrome
  • Francisella tularensis Infection
  • Friedreich’s Ataxia
  • Frontotemporal Dementia
  • Fulminant Hepatitis
  • Fungal Meningitis

Explore More Diseases Starting With:


Explore further as we categorize other ‘F’ diseases by type, such as autoimmune disorders and those affecting specific organs like the heart and lungs. Stay tuned for more detailed insights into these conditions.

Other Diseases Beginning With F (Divided By Type)

Autoimmune Diseases That Start With F

  • Felty’s Syndrome
  • Fibromyalgia
  • Frontal Fibrosing Alopecia
  • Fogo Selvagem (Pemphigus Foliaceus)
  • Familial Mediterranean Fever
  • Fibrosing Alveolitis
  • Fibrositis
  • Fuchs’ Endothelial Dystrophy
  • Functional Neurological Disorder
  • Fungal Arthritis
  • Familial Cold Autoinflammatory Syndrome
  • Familial Polyposis Coli
  • Fibromuscular Dysplasia
  • Fryns Syndrome
  • Functional Dyspepsia

Blood Diseases That Start With F

  • Fanconi Anemia
  • Fibrinogen Deficiency
  • Factor V Leiden Thrombophilia
  • Factor II Deficiency
  • Factor XIII Deficiency
  • Favism (Glucose-6-Phosphate Dehydrogenase Deficiency)
  • Fetal Erythroblastosis
  • Fibrinolytic Purpura
  • Folate-Deficiency Anemia
  • Factor VII Deficiency
  • Factor X Deficiency
  • Familial Hypercholesterolemia
  • Familial Hypophosphatemia
  • Familial Mediterranean Fever
  • Febrile Neutropenia

Bone Diseases That Start With F

  • Fibrous Dysplasia
  • Fong Disease (Nail-Patella Syndrome)
  • Fracture, Stress
  • Fractures, Pathologic
  • Freiberg’s Disease
  • Frontometaphyseal Dysplasia
  • Frostbite
  • Fetal Warfarin Syndrome
  • Fibrodysplasia Ossificans Progressiva
  • Fibrochondrogenesis
  • Fibromatosis, Aggressive
  • Fibromatosis, Plantar
  • Fibrous Histiocytoma, Malignant
  • Fibular Hemimelia
  • Fong’s Disease

Eye Diseases That Start With F

  • Fuchs’ Endothelial Dystrophy
  • Floaters
  • Far-Sightedness (Hyperopia)
  • Flashes
  • Fleck Cornea
  • Floaters
  • Floppy Eyelid Syndrome
  • Foveal Hypoplasia
  • Fraser Syndrome
  • Fundus Flavimaculatus
  • Familial Exudative Vitreoretinopathy
  • Foreign Body in Eye
  • Fungal Eye Infections
  • Fuchs’ Heterochromic Iridocyclitis
  • Fuchs’ Uveitis Syndrome

Ear Diseases That Start With F

  • Foreign Bodies in the Ear
  • Furunculosis (Boils in the Ear Canal)
  • Functional Hearing Loss
  • Fungal Ear Infections (Otomycosis)
  • Fenestral Otosclerosis
  • Fluctuating Hearing Loss
  • Facial Nerve Disorders
  • Fractures of the Temporal Bone
  • Fungal Mastoiditis
  • Frey’s Syndrome
  • Facial Canal Dehiscence
  • Fistula of the Labyrinth
  • Facial Nerve Palsy
  • Fibrous Dysplasia (Affecting the Ear)
  • Facial Spasm

Hand Diseases That Start With F

  1. Felon (Infection of fingertip pulp)
  2. Fibromatosis, Palmar (Dupuytren’s Contracture)
  3. Fractures of the Hand
  4. Frostbite of the Hands
  5. Functional Hand Disorders
  6. Finger Dislocation
  7. Fingertip Injuries
  8. Flexor Tendon Injuries
  9. Foreign Body in Hand
  10. Fibrous Dysplasia of the Hand
  11. Fungal Infections of the Hand
  12. Fibrous Histiocytoma of Hand
  13. Fifth Metacarpal Fracture (Boxer’s Fracture)
  14. Finger Sprain
  15. Fabry Disease (affecting hands)

Lung Diseases That Start With F

  1. Fibrosing Alveolitis
  2. Farmer’s Lung
  3. Flail Chest
  4. Foreign Body in the Bronchi
  5. Fungal Lung Infections
  6. Familial Pulmonary Fibrosis
  7. Focal Segmental Glomerulosclerosis (affecting lungs)
  8. Fibrothorax
  9. Fibrinous Bronchitis
  10. Foreign Body Aspiration
  11. Fungal Pneumonia
  12. Fleck Lung (Pulmonary Hemosiderosis)
  13. Fungal Pleuritis
  14. Flail Lung
  15. Fibrous Mesothelioma of the Pleura

Liver Diseases That Start With F

  1. Fatty Liver Disease
  2. Fibrolamellar Carcinoma
  3. Fulminant Hepatic Failure
  4. Focal Nodular Hyperplasia
  5. Fibrosis of the Liver
  6. Familial Cholestatic Syndromes
  7. Familial Intrahepatic Cholestasis
  8. Fascioliasis (Liver Fluke)
  9. Fibropolycystic Liver Disease
  10. Fibrovascular Polyp of the Liver
  11. Focal Hepatic Glycogenosis
  12. Fructosemia (affecting liver)
  13. Fungal Hepatitis
  14. Fibrin Ring Granulomas (in the liver)
  15. Foreign Bodies in the Liver

Heart Diseases That Start With F

  1. Familial Hypertrophic Cardiomyopathy
  2. Fibromuscular Dysplasia (affecting the heart)
  3. Fabry Disease (affecting heart)
  4. Fetal Heart Defects
  5. Flail Leaflet Syndrome
  6. Fibrinous Pericarditis
  7. Familial Atrial Fibrillation
  8. Floppy Valve Syndrome
  9. Familial Dilated Cardiomyopathy
  10. Fungal Endocarditis
  11. Fiedler’s Myocarditis
  12. Flail Mitral Valve
  13. Fabry Cardiomyopathy
  14. Focal Atrial Tachycardia
  15. Familial Ventricular Tachycardia

Skin Diseases That Start With F

  1. Folliculitis
  2. Frostbite
  3. Fungal Skin Infections
  4. Fibromatosis, Plantar (Ledderhose Disease)
  5. Freckles
  6. Fibrous Papule of the Face
  7. Focal Dermal Hypoplasia
  8. Fox-Fordyce Disease
  9. Furunculosis (Boils)
  10. Focal Hyperhidrosis
  11. Flushing
  12. Fungal Nail Infections
  13. Fibroepithelial Polyps
  14. Flat Warts
  15. Familial Cutaneous Collagenoma

Bacterial Infection That Starts With F

  1. Fusobacterium Infections
  2. Furunculosis (Boils)
  3. Fournier’s Gangrene
  4. Fish Tank Granuloma
  5. Franciscella tularensis Infection
  6. Fungal Bacterial Overgrowth Syndrome
  7. Foodborne Bacterial Infections
  8. Folliculitis (bacterial)
  9. Fecal-Oral Transmission Diseases
  10. Fever of Unknown Origin (bacterial causes)
  11. Facial Cellulitis
  12. Falsey Syndrome (bacterial conjunctivitis)
  13. Foot Ulcer (bacterial infection)
  14. Fever, Bacterial
  15. Facial Erysipelas

Stay engaged as we uncover more about diseases affecting our beloved pets in the next sections, focusing on specific ailments that start with ‘F’ in dogs and cats.

Dog Diseases That Start With F

  • Feline Immunodeficiency Virus (FIV) – in dogs, similar symptoms to FIV in cats
  • Feline Leukemia Virus (FeLV) – in dogs, similar symptoms to FeLV in cats
  • Flea Allergy Dermatitis
  • Food Allergies
  • Fungal Infections
  • Foxtail Plant Injuries
  • Frostbite
  • Fatty Liver Disease
  • Fibrosarcoma
  • Fanconi Syndrome
  • Fungal Keratitis
  • Fibrinous Pleuritis
  • Fibrocartilaginous Embolism
  • Fecal Impaction
  • Foreign Body Ingestion

Cat Diseases That Start With F

  • Feline Immunodeficiency Virus (FIV)
  • Feline Leukemia Virus (FeLV)
  • Feline Asthma
  • Feline Infectious Peritonitis (FIP)
  • Feline Lower Urinary Tract Disease (FLUTD)
  • Feline Panleukopenia (Feline Distemper)
  • Feline Herpesvirus
  • Feline Calicivirus
  • Feline Hypertrophic Cardiomyopathy
  • Flea Allergy Dermatitis
  • Fungal Infections (Ringworm)
  • Feline Acne
  • Feline Idiopathic Cystitis
  • Feline Chlamydiosis
  • Feline Sarcoma

diiseases that start with f

We hope this extensive guide on diseases beginning with ‘F’ has been informative and helpful. Stay informed and proactive about health, whether it’s for humans or our furry friends. Remember, knowledge is the key to better health and early intervention.