If the composition of the urine changes, stones can be formed in the kidneys, ureter or bladder, etc. Specifically, the main causes of stones are the following: 1. The quality of drinking water is not good. In some areas, drinking water is hard water, which contains higher crystals and calcium, making a person’s urine calcium higher and easy to form stones. In addition, the amount of water is too small, urine concentration, also easy to cause stones. 2, bad dietary habits, consumption of food containing high oxalic acid and calcium, such as animal offal, spinach, tofu and other soy products, strong tea, wine, coffee, etc.. As well as food is too fine, eat more meat, eat vegetables and other foods containing fiber is too small, also prone to urinary stones. 3, different living environment, climate, in hot areas, sweating more, urine is easy to concentrate, the formation of urinary stones. 4, bad lifestyle, daily life, too little exercise, too little activity, also easy to appear urinary stones. 5, In addition, the body suffers from certain diseases, resulting in high blood calcium or high urinary calcium disease. Such as hyperparathyroidism, gout, fracture, paralysis, hemolytic bone tumor and other diseases can increase urinary calcium and make it easy to form kidney stones. Various causes of urinary tract obstruction causing urine depression and urinary tract infection also predispose to stones.