feline lower urinary tract disease (fLUtD) is a common problem in cats. the objectives of the study were to determine the prevalence, clinical signs, and causes of fLUtD and the risk factors for fLUtD. The medical records of 3486 cats visiting Chiang Mai University Small Animal Veterinary Teaching Hospital (VTH) between November 2016 and October 2017 were reviewed. An age-matched casecontrol study was performed to determine the risk factors for FLUTD by comparing 78 cats with FLUTD and 78 clinically normal age-matched cats. For each animal, potential risk data were obtained from medical records and cat owner interviews; these were analysed for associations with fLUtD. Multivariable logistic regression analysis was performed to estimate the odds ratios and to adjust for expected confounding factors. the prevalence of fLUtD in cats visiting the chiang Mai University Veterinary Teaching Hospital was 2.2%. The most common clinical signs identified were urethral obstruction (55.1%) and haematuria (23.1%). The most common diagnoses were feline idiopathic cystitis (FIC) (57.7%) and urolithiasis (struvite) (18%). The multivariable logistic regression analysis results indicated that fLUtD was most likely to be diagnosed in castrated male cats. fic and urolithiasis were the most common diagnoses in cats with fLUtD, and male sex and castration increased the risk of fLUtD.Feline lower urinary tract disease (FLUTD), a common disease in cats, is a syndrome that affects the reproductive tract, urinary bladder or urethra. The clinical signs of FLUTD are dysuria, haematuria, stranguria, pollakiuria and periuria. The prevalence of FLUTD among cats that had visited animal hospitals and clinics was 1.5% in the United States 1 and 2.2% in Bangkok, Thailand 2 . FLUTD can be obstructive or non-obstructive. Obstructions may occur as inflammatory debris from feline idiopathic cystitis (FIC), urethral plugs or uroliths. Non-obstructive causes include FIC, uroliths, urothelial carcinoma, anatomic defects (such as urethral stricture) and urinary tract infection (UTI) 3 .The risk factors for FLUTD differ across countries due to geography, season, diets 4 and cats' lifestyle. In New Zealand, low activity and indoor lifestyles were identified as risk factors for FLUTD 5 . In Norway, FLUTD was commonly found in male cats with an indoor lifestyle 6 . In Belgium, indoor confinement was the common risk factor for FLUTD 7 . In Bangkok, Thailand, a diet of commercial dry food and overweight were found to increase the risk for FLUTD 2 . In Austria, overweight cats had an increased risk for FLUTD, but the type of diet was not associated with FLUTD 8 .The Small Animal Veterinary Teaching Hospital in Chiang Mai, Thailand, receives a substantial number of feline patients each year. No one has yet evaluated the risk factors associated with FLUTD in this region. Therefore, the objectives of the present study were to determine the prevalence, clinical signs, and causes of FLUTD and risk factors for FLUTD in cats in Chiang Mai, Thailand.