A leukorrhea PH of 5.1 is not normal. Under normal circumstances, the PH value of leukorrhea is 3.8-4.4, and if it is more than 4.5, there may be bacterial infection, because the vaginal environment is weakly acidic, and if there is an increase in PH, then it is easy to lead to the growth of bacteria, which is more likely to cause bacterial vaginitis. If the PH 5.1 of the leukorrhea is not symptomatic, then you can observe more, pay attention to cleanliness and hygiene, and change your underwear; if there is an increase in secretions, vulvar odor, vulvar itching, etc., then you need to treat it in a timely manner. You can find out what type of vaginitis you have and choose the right way to treat it. It is recommended to consult a doctor in time to clarify the diagnosis and then intervene to deal with it.