With the advent of summer, more and more patients are coming to the hospital with “renal colic”. The main clinical symptom is the sudden onset of pain in the affected side of the waist, colic is intense and unbearable, often radiating down the ureter, but also down the abdomen, groin, testicles, labia majora, inner thighs, accompanied by nausea, vomiting, sweating and other symptoms, some patients even feel like dying. One of the important reasons is that in hot weather, sweating and drinking less water lead to concentrated urine and urine salt deposits, which can easily form urinary stones. These symptoms can occur when stone activity causes obstruction of the renal pelvis or ureter. Generally speaking, according to the main chemical composition of urinary stones, oxalate stones, urate stones and phosphate stones are common. The following are some prevention methods according to the different causes of stone formation. Drinking water for diuresis: In general, adults should drink 2-3 liters of water per day, and children should drink less. In summer, the amount of water can be increased to maintain urine volume of about 2-3 liters/day. In the method of drinking water: drink water around the clock, and must be balanced day and night. Night time is the most concentrated urine, so before bedtime, after getting up during sleep to urinate must also drink about 300 ml of water. At the same time, you can participate in sports, which can prevent stones and promote stone removal. Diet should be light: low sugar, low fat, low sodium diet is appropriate, and pay attention to meat, cereals, vegetables with food. According to the composition of urinary stones, it is introduced as follows: 1. Oxalate stones: calcium oxalate stones are the most common. Reducing the intake of exogenous oxalic acid can reduce the excretion of urinary oxalic acid to a certain extent. Should avoid spinach, peppers, potatoes and soy products and chocolate, cola, beer; citrus, lemon, tomatoes, strawberries, etc. Oral vitamin B6 and magnesium preparations are beneficial to the prevention and treatment of specific high oxalate stones. 2, urate stones: limit protein intake and consume more fresh vegetables and fruits. Desirable foods: grains and cereals should be mainly fine grains; green vegetables and fruits can be consumed at will; eggs and milk can be consumed appropriately. It is recommended to adopt an alkaline diet, such as oral sodium bicarbonate can make the urine alkaline. Foods to be avoided are: animal offal and poultry, meat, fish, crustaceans. Drink less alcohol, drinking alcohol can increase the level of uric acid, alcohol also tends to cause the concentration of urine. 3, phosphate stones: acidic foods such as umeboshi and plum are recommended. Eat less dairy products, tofu, shrimp, kelp, egg yolk, etc. Third, drugs: large amounts of vitamin D, vitamin C, corticosteroids, aminoglutethimide, tetracycline, aspirin, etc. can trigger kidney stones. Glaucoma patients taking acetazolamide can form calcium phosphate supersaturation and cause stones. Patients with gout and hyperuricemia taking sulfonamide (propoxur) drugs are prone to precipitate and form stones because the acetyl derivatives are excreted by the kidneys and have low solubility in acidic urine. The growth of urinary stones is a longer process. Once stones are formed, secondary damage to the kidney will occur, manifesting as urinary tract obstruction, secondary infection and epithelial lesions, leading to serious uremia and possible cancer. As the size of the stone increases, symptoms such as dull pain in the kidney area and hematuria will gradually appear; when the stone enters the ureter and causes hydronephrosis or renal colic, the pain will be unbearable. Therefore, it is necessary to consult a doctor promptly when there is discomfort in urination in both waists to avoid delaying the diagnosis and treatment.