Avoid milk and milk products if you have had a calcium or phosphorus kidney stone. Avoid excessive sweating. Small stone, uncomplicated by obstruction or infection may need no specific treatment. Treatment to remove larger stones, if they don't pass spontaneously and are causing complications, infection or severe pain. Stones due to excess calcium in the body may require surgical removal of abnormal parathyroid tissue.
Small stones pass easily into the ureter through the urine.
Stones that are big enough to pass but not small enough to pass with ease cause excruciating pain. These usually pass in a few days. If the stone stops and blocks urine, it must be removed to prevent further kidney damage. To trap it, urinate each time through a piece of gauze. The stone may pass without discomfort.