Normal urine has a yellowish or colorless clear liquid color, which is secreted from the kidneys and is excreted through the renal pelvis, ureter, bladder, and urethra. The dark yellow color of urine has two causes, one is physiological and the other is pathological. In the early stages of pregnancy, some patients may experience nausea, vomiting and other early pregnancy reactions, which may lead to a decrease in drinking and eating, and a decrease in drinking may lead to a concentration of urine, resulting in dark yellow urine. Another reason is to consider pathological reasons, such as the combination of liver diseases, such as acute hepatitis, biliary obstruction, etc., resulting in the increase of bilirubin in the blood and cause the deepening of urine color, this situation needs to go to the hospital in a timely manner for examination and clear diagnosis. Also, if there is a combination of urinary tract infection and stones, the urine color will deepen, but this condition is usually accompanied by frequent urination, urgent urination, painful urination or pain in the lower back and abdomen. To sum up, the dark yellow color of urine after pregnancy needs to be considered as a physiological reason of drinking too little water, but also as a pathological reason of liver and gallbladder disease and urinary system infection, and the specific situation needs to be judged in the context of the patient’s specific situation.