Disease analysis: Hello, tea contains substances that form stones. Drinking a lot of tea often increases the composition of oxalic acid in the human body. Oxalic acid combines with calcium in food to form calcium oxalate, which is the main component of stones. Therefore, the higher the concentration of tea, the greater the harm to the body and the higher the possibility of forming stones. Suggestion: Therefore, kidney calculi patients are advised to drink tea in moderation. Try not to drink strong tea or drink tea on an empty stomach.