Is it normal to have dark yellow urine due to drinking less water?
Generally, yellow urine caused by low water intake is a normal phenomenon, and the color will gradually become lighter after increasing water consumption. If there are abnormalities, it is recommended to seek medical attention promptly. Detailed analysis is as follows:

When water intake is significantly insufficient, urine becomes concentrated, resulting in darker yellow or amber-colored urine. This is a normal regulatory response of the body and does not accompany other discomforts. The urine color typically returns to normal shortly after rehydration.
If yellow urine occurs alongside symptoms such as frequent urination, urgency, painful urination, or if the urine has an unusual odor or appears cloudy, it may not be solely due to inadequate water intake. Urinary tract infections or other issues should be considered, and further medical evaluation is necessary in such cases.
It is important to maintain adequate daily water intake and avoid long-term insufficient hydration. If yellow urine persists even after increasing water consumption, or if other symptoms occur, timely medical consultation and examination are advised to identify the underlying cause for appropriate management.