Low urine pH is usually caused by the following reasons: 1. Gout is very likely to cause low pH, which may be caused by excessive consumption of high purine foods, and may be accompanied by joint swelling and pain, as well as joint redness and swelling. The symptoms of diabetes are caused by excessive consumption of foods with high sugar content or by genetic factors, which can be controlled by using insulin under the diagnosis of a physician. In addition to the above, high fever may also cause low urine pH. Low urine pH must be further examined under the guidance of a doctor and treated according to the results.