However, sometimes chemical present in the urine crystallize to form kidney stones. It may start small and as time progresses, it grows in size. Its composition may also vary, however, the most common constituents of kidney stones are calcium, oxalate, phosphate and uric acid. Some people are more prone to kidney stones than others and they tend to suffer from painful urination, vomiting, nausea, smelly urine, pain in the abdomen, back and sides of the body.