Disease Library
A comprehensive reference covering feline diseases across every major body system — causes, symptoms, diagnosis, treatment, and prevention.
Feline Indolent Ulcer (Rodent Ulcer)
Another specific presentation within the Eosinophilic Granuloma Complex, causing a characteristic ulcerated lesion on the upper lip —…
infectiousFeline Infectious Peritonitis (FIP)
FIP is caused by a mutated form of a very common and usually harmless intestinal virus (feline coronavirus). In a small percentage of…
cancerFeline Infiltrative Lipoma
A locally invasive variant of the common, typically benign lipoma (fatty tumor), genuinely uncommon in cats — unlike standard lipoma which…
digestiveFeline Inflammatory Bowel Disease
IBD is a chronic condition where the intestinal lining becomes persistently inflamed, causing ongoing vomiting, diarrhea, and/or weight…
earFeline Inflammatory Polyps (Aural Polyps)
Benign (non-cancerous) growths that develop within the ear canal or middle ear, often extending from the eustachian tube area — notably…
cancerFeline Injection-Site Sarcoma (FISS)
An aggressive, locally invasive tumor that can develop at the site of a prior injection (historically most associated with certain…
emergency traumaFeline Insect Sting Reaction (Bee/Wasp)
A reaction to a bee, wasp, or other stinging insect sting, ranging from a mild, localized swelling to a genuinely dangerous systemic…
endocrineFeline Insulinoma
A rare tumor of the insulin-producing cells within the pancreas, causing inappropriate, excessive insulin release regardless of blood sugar…
parasiticFeline Intestinal Helminth Infection (Roundworm, Tapeworm, Hookworm)
Intestinal worms — most commonly roundworms, tapeworms, and less often hookworms — are among the most common parasites affecting cats,…
digestiveFeline Intestinal Lymphangiectasia
A condition involving abnormal dilation of the lymphatic vessels within the intestinal wall, genuinely uncommon in cats and much more…
digestiveFeline Intussusception
A condition where one segment of intestine telescopes into an adjacent segment, similar to a collapsing telescope — this causes an…
eyeFeline Iris Coloboma
A congenital gap or defect in the iris (the colored part of the eye), genuinely uncommon and often causing minimal functional impact — this…
neurologicalFeline Ischemic Encephalopathy
A sudden neurological condition resulting from an interruption of blood flow to part of the brain, historically associated in some regions…
infectiousFeline L-Form Bacterial Infection
A genuinely unusual bacterial infection where bacteria lacking their normal protective cell wall cause illness, most commonly following a…
respiratoryFeline Laryngeal Collapse
A condition where the structures of the larynx (voice box) lose normal support and partially collapse, causing airway obstruction — often…
respiratoryFeline Laryngeal Paralysis
A condition where the muscles controlling the larynx (voice box) fail to open normally during breathing, genuinely uncommon in cats…
musculoskeletalFeline Legg-Calvé-Perthes Disease
A condition affecting the hip joint in young, growing cats, where the blood supply to the head of the femur (thigh bone) becomes disrupted,…
eyeFeline Lens Luxation
A displacement of the eye's lens from its normal position, either partially (subluxation) or completely (luxation) — can occur secondary to…
eyeFeline Lens-Induced Uveitis
A specific form of eye inflammation (uveitis) triggered by the body's immune response to lens proteins, most commonly following cataract…
infectiousFeline Leptospirosis
A bacterial infection much more extensively discussed and clinically significant in dogs, with cats generally considered more resistant to…
infectiousFeline Leukemia Virus (FeLV) infection
FeLV is a retrovirus that suppresses the immune system and can cause cancers (especially lymphoma) and severe anemia. It's one of the most…
poisoning toxicologyFeline Lilium spp. / Hemerocallis spp. toxicosis
Lily toxicity is one of the most severe and time-critical poisonings covered in this library — true lilies and daylilies are capable of…
poisoning toxicologyFeline Lily of the Valley Toxicosis
While true lilies (Lilium species) causing severe kidney injury are covered in their own entry, this addresses a botanically different…
skinFeline Linear Granuloma
A third specific presentation within the Eosinophilic Granuloma Complex, causing a characteristic raised, linear (line-shaped) lesion most…