Relationship between lower urinary tract symptoms and frailty

Objective To elucidate the relationship between frailty and lower urinary tract symptoms (LUTS). Methods We longitudinally evaluated the temporal changes and the relationships between frailty and LUTS in 247 community‐dwelling adults (45 years or older) at baseline and at a 5‐year follow‐up. We used the Fried phenotype (phenotype‐based frailty), 5‐item modified frailty index (5i‐mFI; comorbidity‐based frailty), and frailty discriminant score (comprehensive frailty assessment) to evaluate frailty. LUTS were evaluated using the international prostate symptom score (IPSS) and overactive bladder symptom score (OABSS). Results We analyzed 247 participants with a median age of 60 years. The median IPSS and OABSS were significantly increased over the 5 years. The proportion of frail individuals did not increase significantly over the 5 years. Of the three frailty assessment tools, the 5i‐mFI score significantly increased between 2014 and 2019. Multiple linear regression analyses showed that the 5i‐mFI score was significantly associated with the severity of LUTS in 2014 to 5i‐mFI in 2019 but not with 5i‐mFI in 2014 to the severity of LUTS in 2019. Conclusion The effect of LUTS on frailty might be greater than the effect of frailty on LUTS. Further large‐scale studies are needed to elucidate the relationship between LUTS and frailty.