The PH value of morning urine is 5.0 for a long time, which may be a physiological phenomenon, or it may be caused by pathological factors such as urinary tract infection or acidosis. 1. Physiological phenomenon: the normal human urine PH value is between 5.0 and 8.0, with a relatively large variation. So the morning urine PH value of 5.0 is also within the normal range. If there are no other uncomfortable symptoms, kidney function tests and other tests are normal, you can generally continue to observe. 2. Urinary system infection: if accompanied by other uncomfortable symptoms, such as fever, or with frequent urination, urinary urgency, urinary incontinence; consider the urinary system infection, which can also cause the morning urine PH value of 5.0. 3. Acidosis: accompanied by the appearance of deep breathing, dyspnea, etc., need to consider acidosis, can lead to morning urine PH value is relatively low. The PH value of morning urine is 5.0 for a long time, there may be other reasons, it is recommended to actively seek medical treatment, improve the examination, find the cause of the disease, and if necessary, cooperate with the doctor for treatment.