Obstructive kidney disease, which is mostly caused by kidney stones (also called nephrolithiasis, or kidney calculi), is a major cause of chronic kidney disease. Fortunately, most stones pass from the body without any intervention. But if you, a family member, a friend, or a simple acquaintance isn't so fortunate, the following article can help you understand the structure of your urinary system. You'll learn what stones are made of and their causes, the symptoms and possible complications of kidney stones, and finally, what you can do to prevent them from occurring in the first place and how to treat them once they appear.