What causes acidic urine?

It is normal. Thus most people on a normal diet have acidic urine. Means that urinary ph is< 7.0. Ph of 5.0 - 6.5, which is mildly acidic is normal. Citrus fruits or juices, vinegar etc. Tend to produce acidic urine. Acidic urine is beneficial if subject has a tendency toward calcium kidney or urinary stones. Can be a problem with subjects who have interstitial cystitis where we advise urinary alkalization.