The normal blood pH balance in the human body is between 7.35 and 7.45, says MedicineNet. Blood pH represents the concentration of hydrogen ions in the blood, and pH stands for power of hydrogen.
Blood pH higher than 7.45 is alkaline and lower than 7.35 is acidic. Very small movements in pH levels significantly change the amount of acid in the blood, which interferes with normal bodily functions. Several factors can change pH levels such as disease, food, medications, kidney function and urinary tract infections. Kidney stones often form as a result of both high and low blood pH levels, states Healthline.