There are two main factors that cause low morning urine: first, physiological factors, the night due to dietary reasons, less water intake, and no water, if there are also several night urination, it will cause low urine volume the next morning. And it is likely to lead to yellowish urine color, but this is a normal physiological phenomenon, not a disease. Secondly, pathological factors, if the morning urine is reduced for a long time, and the diet is normal, it may be caused by the lesions occurring in the urinary system such as acute nephritis, acute prostatitis, and it can not be ruled out the simultaneous existence of pus, bacteriuria, crystalluria, and so on. If a long time morning urine, it is necessary to send the morning urine to the examination, to find out which aspect of the cause, so that the good treatment, to avoid thus affecting the health of the body.