Gallbladder stones and kidney stones may sound similar, but they affect different organs and have distinct causes. Gallbladder stones form due to excess cholesterol or bile salts and cause pain in the upper abdomen, especially after eating fatty foods. Kidney stones, on the other hand, develop from mineral deposits in the kidneys and lead to sharp pain in the lower back or while urinating. Consult a Doctor Shrikant Kurhade - Best gastroenterologist for Early diagnosis and proper treatment.