Vitamin D and Overactive Bladder

This study looked at vitamin D levels in men and how this impacted lower urinary tract symptoms (LUTS). It concluded that reduced vitamin D in men may affect LUTS. 

Lower urinary tract symptoms (LUTS) are symptoms which result in decreased urinary function. This can include feelings of urgent urination, not emptying your bladder completely when urinating, urine dribble, straining to urinate, a weak or interrupted stream of urine and prolonged urination, among many others. Both men and women can be affected by LUTS. LUTS are often caused by a blockage of the bladder or urethra (the tube carrying urine out of the body). LUTS can be caused by conditions such as benign prostatic hyperplasia (a prostate condition in men) and overactive bladder (OAB).

Other studies have made connections between LUTS and vitamin D. Studies providing definite connections, however, are limited. 

434 men with LUTS were included in the study. The study lasted 3 years. Levels of vitamin D were assessed throughout the year. This was to combat any seasonal differences that might occur. The men were also assessed for OAB and prostate symptoms and physical activity level. Patients who were found to be vitamin D deficient were injected with vitamin D. 

Vitamin D levels were lowest in winter. Approximately 75% of patients had reduced vitamin D levels in winter versus other seasons. Prostate and OAB symptoms were found to be at their worst in winter. Lower vitamin D levels were found to be associated with worsened OAB symptoms, not worsened prostate symptoms. When vitamin D was supplemented, OAB symptoms improved.  

This study concluded that vitamin D levels were associated with worsened OAB symptoms. Vitamin D levels were lowest in winter and OAB symptoms were worst in winter. 

The authors note that the time spent outside (vitamin D from the sunshine) was not recorded in the study. This may affect the study's results. 

If you are interested in learning more about vitamin D and OAB, contact your doctor.