Drinking tea, especially strong green tea, may induce the appearance of stones if you drink too much. In the Chinese stone survey, about 60%-70% of stone patients are calcium oxalate stones, and excessive intake of oxalic acid is an important trigger for the occurrence of calcium oxalate stones. Tea contains oxalic acid, and the oxalic acid in tea is more easily absorbed by the body, once the oxalic acid in the body in excess, will first lead to hyperoxaluria, and then oxalic acid and calcium ions combined in the urine will form insoluble calcium oxalate precipitation, over time, it will become calcium oxalate stones. So it is best not to drink strong tea, light tea can be consumed in moderation, otherwise it does tend to lead to the occurrence of stones. Oxalic acid mainly exists in daily life vegetables, such as spinach, in addition, soy products, fruits, cereals also contain oxalic acid, in order to avoid the occurrence of stones, on the one hand, it is recommended to control the intake of such foods in daily life, on the other hand, you also need to pay attention to calcium-rich food, also appropriate to control, like milk, eggs, etc., do not over-supplement calcium. Of course, you should not stop eating calcium-rich foods because you are worried about growing stones, otherwise it will easily cause the blood calcium concentration in the body to drop, and the calcium in the bones will be reabsorbed into the blood, causing hypercalcemia, which is more likely to form stones.