Causes of urinary stone formation include abnormal body metabolism, urinary tract obstruction and infection, dietary habits and lifestyle, and drug use. Abnormal body metabolism: Increased excretion of substances that form urinary stones, due to increased excretion of calcium, oxalic acid, uric acid or cystine in the urine, which can easily form stones. For example, increased urinary calcium in patients who are bedridden for a long time and hyperparathyroidism; increased uric acid excretion in gout patients; increased cystine excretion is common in patients with familial cystinuria. Urinary tract obstruction and infection: Urinary tract obstruction, infection and the presence of foreign bodies in the urinary tract are all local factors that induce stone formation; obstruction can lead to infection and stone formation, and stones can aggravate the degree of obstruction and infection. Dietary habits and lifestyle, etc.: Drinking less water makes the urine volume decrease and the concentration of salts and organic substances in the urine increase. Lack of exercise tends to cause urine deposits and formation of stones. Love to eat foods with high oxalic acid content. Love to eat spinach, beans, cocoa, tea, etc., which are all rich in oxalic acid and prone to oxalic acid stones. Excessive intake of purines. All kinds of animal offal, seafood, peanuts, etc. all contain more purine components, more to eat easy to produce uric acid stones. Drug use: drugs can cause kidney stones. A class of drugs for high urine concentration and relatively low solubility, such as aminoglutethimide and sulfonamides; a class of drugs for drugs that can induce stone formation, such as acetazolamide and corticosteroids. Urinary stones are formed for various reasons and should be prevented by addressing the causes. Drinking more water and eating less oxalic acid and purine-rich foods can help prevent them.