Stones form due to many reasons common causes of the stone formation are:
- Supersaturation of urine by decreases intakes of water and or hot environmental condition where there is loss of body fluid in atmosphere by perspiration, and in breathing.
- Urine infection where crystals deposit themselves on and around the infection causing organism, and the stone grows over the period in the supersaturated urine.
- Diet rich in oxalates, Uric acid, can increase the incidence of stone formation.
- Functional or structural obstruction of the urinary system can precipitate the stone formation. Like Pelviureteric junction obstruction, Ectopic kidney, Horseshoe kidney.