Can kidney stones be treated?

Yes: Through laser treatment to break down the stones.

Eminently: Small stones may pass on their own, though the passage is generally painful. Stones may be "pulverized" by lithotripsy and then pass through the urine. Some times the stones may need to be removed surgically and in extreme cases may require removal of the kidney.

Kidney stone.: Kidney stones up to 5mm in size will predictably pass on their own. Just drink plenty of water so you produce a lot of urine, dilate those ureters and allow the stone to pass. It may hurt while it's on its way out, but it'll pass. Bigger stones will likely get stuck and will cause tremendous pain and will have to be removed by lithotripsy or cystoscopy.