It is normal for morning urine to be pale yellow, yellow or dark yellow. The color of urine is determined by the concentration of pigments in the urine. If you drink more water at night, you experience an increase in urine volume, which is diluted by urination, and the next day’s morning urine will be slightly lighter in color. If you drink less water at night, after a night of metabolism, the urine will be concentrated, will be relatively yellowish, as long as the timely rehydration can be. The color in the urine is mainly from pigment and glomerular filtration of urobilin, the color depth is related to the amount of urine, the pH of the urine, diet, medication and disease. If the urine is bright red or dark red, consider, for example, urethritis, urinary stones, etc. Hematuria is often accompanied by frequent urination, urinary urgency, and painful urination problems. If it is painless hematuria, check for tumors. Strong tea-colored or yellow-brown urine often suggests liver problems. Prolonged yellowish-brown urine, accompanied by, for example, jaundice, fatigue, upper abdominal discomfort and pain, may be bilirubinuria or urobilinogenuria. If the color of your morning urine is abnormal, please seek medical attention as soon as possible to avoid adverse consequences.