Under normal circumstances buckwheat tea does not cause cancer. Buckwheat is rich in calcium, iron, zinc, magnesium and other trace elements, moderate consumption helps to clear the bowels and laxative, generally does not have adverse effects on the body. However, buckwheat tea improperly stored or substandard quality, pesticide residues, there may be a risk of cancer. If the quality of buckwheat tea, the right amount of water to drink, with oil and grease, heat and fire, intestinal laxative effect, etc., beneficial to the body. However, if improperly stored, mold, aflatoxin, or substandard quality, pesticide residues, in the long-term infusion of water to drink, may increase the risk of cancer. Especially if the patient itself has a more serious liver disease, metabolic abnormalities, try to avoid drinking large amounts of buckwheat tea. The cause of cancer is complex, there is no clear pathogenesis, mainly related to radiation exposure, genetics and immunity and other factors, drinking quality buckwheat tea does not generally lead to cancer, do not worry too much.