The reasons for drinking more water and urinating less include physiological factors, such as lack of water in the body; and pathological factors, such as renal insufficiency and prostate hyperplasia. 1. Physiological factors: when the patient is extremely dehydrated, strenuous exercise, etc., even if he drinks more water, there will be less urination. Because most of the water is absorbed by the body to replenish its own state of dehydration, so there will be a situation of drinking more water and urinating less, which is a normal physiological phenomenon and does not need to be particularly worried. 2. Renal insufficiency: due to congenital or acquired factors, the patient’s kidney function is abnormal. As a result, the patient drinks more water and the kidney function decreases, resulting in a decrease in urine production and less urination. 3. Prostatic hyperplasia: If the patient suffers from prostatic hyperplasia, when the gland of the prostate continues to increase in size, it will gradually compress the nearby urethra, causing the patient to have difficulty in urination, urinary retention and other situations. As a result, it causes patients to urinate less even when they drink a lot of water. Drinking a lot of water and urinating less may also be caused by other factors, if the patient has this situation for a long time, it is recommended that the patient go to the regular hospital in a timely manner to improve the relevant examination, to clarify the cause of the disease, and comply with the doctor’s instructions for treatment, so as not to cause adverse consequences.