Kidney stones form when minerals in urine crystallize and accumulate. There are several types of kidney stones including calcium, uric acid, struvite, and cystine stones. Calcium stones are the most common type and form due to high levels of calcium, oxalate, and other minerals in urine. Symptoms of kidney stones include sharp pain in the back or side, painful urination, blood in urine, nausea, and vomiting. Risk factors include dehydration, family history, certain diets, and some medical conditions. Treatment focuses on lifestyle changes like drinking fluids, modifying diet, and managing the underlying condition causing stone formation.