Due to excess calcium (calcium been pulled from bones) in response to too acidic due to high protein high fat diet( calcium is alkaline mineral) or low calcium intake.
Drink 8 ounce of fresh-squeezed lemon juice followed by 1 ounce of lemon juice mixed with a glass of water. Repeat every hour for 12 hours. ( it contains citric acid which dissolves the stones).
Take ascorbic acid form of vit C to bowel tolerance. Begin with 1-2g per hour.