Wood LN, et al. - Given increased fluid intake exacerbates overactive bladder (OAB) symptoms. This systematic review was carried out to assess the potential health advantages of increased water intake and to identify specific subpopulations who need increased hydration. In patients without nephrolithiasis, no benefit to drinking eight glasses of water a day was suggested in the findings. In addition, excess fluid intake could exacerbate the symptoms of overactive bladder.