Patients with kidney stones are advised not to drink black tea. The main reasons that can cause kidney stones are dietary factors; work, life and environmental factors; personal habits and personal constitution. Among them, dietary factors play a big part in the formation of kidney stones, such as those who like to drink tea; those who eat spinach, beets, chocolate, chestnuts, pine nuts and wheat bran, are prone to oxalic acid stones, because these foods contain more oxalic acid. From here, it can be seen that if you already have kidney stones, it is best not to drink black tea, because black tea may lead to the formation of new stones, existing stones further increase, for kidney stone patients is very unfavorable. If you want to drink water, try to drink mainly plain water. Drinking more plain water will increase the formation of urine, which has a strong flushing effect on the urethra, which can promote the discharge of existing stones on the one hand; on the other hand, it can also prevent the formation of new stones. In addition, usually try to participate in physical exercise, also conducive to the discharge of stones.