The first situation is that when a woman drinks less water after pregnancy and therefore excretes less urine, the darkening and yellowing of urine occurs when it is concentrated. In the second case, when women suffer from inflammation of the urinary system or have kidney diseases, the yellow urine will also occur. In the third case, when women take certain medications, such as B vitamins, the yellowing of urine may also occur. If it is caused by the first condition, women need to drink more water and then they will get gradual relief. If it is caused by the second condition, women need to go to the hospital for a routine urine or kidney function test, and if there are abnormalities, they need to be actively treated. If the third condition is caused by medication, the color of the urine will change to normal after stopping the medication.