It may be caused by physiological reasons, or it may be caused by pathological factors, such as jaundice, hepatitis, cirrhosis, urinary tract infections and so on. 1. Physiological factors: If the elderly drink less water, or when the weather is hotter and sweating increases, it will cause the urine to become concentrated, and then the phenomenon of yellow urine will occur. It is recommended to drink more water, can dilute the urine, but also can supplement the body’s needs. 2. Pathological factors: such as jaundice, hepatitis, cirrhosis, urinary tract infection and other factors. If jaundice occurs in the elderly, there will be yellow urine, in addition, the whole body skin and sclera will also have yellow color. The liver metabolizes bilirubin, and when hepatitis or cirrhosis occurs, the metabolic function is abnormal, and there will be yellow urine. After urinary tract infection, patients in addition to frequent urination, urinary pain and other discomforts, some patients will also have symptoms of yellow urine. It is recommended to drink a lot of water on a daily basis, if the symptoms have not been improved or accompanied by other symptoms, it is necessary to seek medical treatment in a timely manner.