Drinking a lot of water and urinating less may be caused by physiological factors, kidney diseases, obstructive diseases and other factors. 1. Physiological factors: Drinking a lot of water, but sweating more or frequent vomiting and diarrhea, resulting in too little water content in the body and a decrease in the amount of urine. 2. Kidney diseases: for example, glomerulonephritis, which may lead to water and sodium retention, may reduce the amount of urine production, and may be accompanied by swelling of the lower limbs, puffy eyelids and other abnormal manifestations. 3. Obstructive diseases: for example, bilateral ureteral stones, urethral stenosis, prostatic hyperplasia, etc., may lead to the urine can not be excreted normally, will be accumulated in the bladder or kidney, will lead to a decrease in the amount of urine. Drinking a lot of urine less, and there are other abnormal performance, may be the existence of disease factors, it is recommended to go to the hospital urology department for examination and treatment.