Getting up in the morning and urinating less can be a physiological phenomenon or a pathology. For example, drinking less water or related to the kidneys. 1. Physiological phenomenon: If you drink less water at night when you go to bed, after a night of metabolism, the water will be discharged from the body by way of sweat, which will lead to the emergence of low urine in the morning. 2. Pathologic phenomenon: (1) Pre-renal: Pre-renal oliguria is caused by insufficient blood supply to the kidneys or a decrease in the amount of blood flowing through the kidneys, resulting in a decrease in the amount of blood flowing through the glomerulus per unit of time, which lowers the glomerular filtration pressure, thus reducing the formation of primary urine. (2) Nephrogenic: Injury to the kidneys themselves, such as damage to glomerular and tubular function, leading to uremia, which reduces the glomerular filtration rate and results in decreased urine production. (3) Post-renal: Post-renal is mainly due to the obstruction of the urethra, such as double ureteral stone calculus, prostate hyperplasia and other causes of post-renal obstruction, which leads to reduced urine output. The situation of getting up in the morning and urinating less, if the physiological reasons are excluded, it is recommended to go to the hospital in time for further diagnosis and treatment.