What are the main differential diagnoses for behavioral changes in cats?

The differential diagnoses for behavioral changes in cats include FLUTD, urolithiasis, bacterial cystitis, gastrointestinal tract diseases, oral cavity diseases, orthopedic diseases, hypertension, feline immunodeficiency virus (FIV), feline leukemia virus (FeLV), feline infectious peritonitis (FIP), and cognitive dysfunction syndrome (CDS).
FLUTD, urolithiasis, and bacterial cystitis are the most common differential diagnoses for behavioral changes in cats.
Feline immunodeficiency virus (FIV) and feline leukemia virus (FeLV) are the most common differential diagnoses for behavioral changes in cats.