The elderly bedridden for a long time without urine may be a normal physiological phenomenon, but it may also be caused by renal failure, urinary retention and other reasons. 1. Normal physiological phenomenon: when the lack of water intake, excessive loss of water, the body’s antidiuretic hormone secretion increases, the kidneys produce less urine, thus the elderly bedridden for 3 hours without urine, is a normal phenomenon. 2. Renal failure: as the elderly age, renal failure may occur, the kidneys can not effectively filter excess water or toxins, the above situation will occur. 3. Urinary retention: Urinary retention means that there is urine in the bladder, but because of poor bladder contraction function, prostate enlargement in male patients, etc., the urine cannot be discharged out of the body through the urethra smoothly, and there will be a decrease in the volume of urine or a decrease in the frequency of urination, and thus the situation of the elderly being bedridden and having no urine for a long time occurs. If the elderly bedridden for a long time without urine, you can try to change the position after urination; if the symptoms continue to be unrelieved, and the abdomen is very bloated, should go to the regular hospital in a timely manner, to clarify the cause of the disease, under the guidance of professional doctors to take targeted treatment.