Elderly catheterization with less urine may be caused by drinking less water, cardiac insufficiency, renal insufficiency and so on. 1. Drink less: If the elderly drink less water, the amount of urine produced will be less, so catheterization will feel less urine is a normal physiological phenomenon. 2. cardiac insufficiency: if the elderly cardiac insufficiency, it will easily lead to a reduction in the glomerular filtration rate, and both lower extremities will also occur edema, urine production decreased. 3. renal insufficiency: often due to glomerular sclerosis or necrosis caused by chronic renal insufficiency, the glomerular filtration rate is reduced to produce less urine. Elderly catheterization urine less, if excluded is physiological reasons, should promptly go to the hospital, identify the causes after targeted treatment.