Many patients are not suitable for drinking buckwheat tea, in daily life, mainly seen in the following categories: First, patients with stomach problems, mostly seen in severe acid reflux, and nausea, vomiting, mostly manifested as gastritis, gastric ulcer, not suitable for drinking through buckwheat tea, or it will lead to aggravation. Second, patients prone to allergies, especially allergies prone to asthma, itchy skin, with buckwheat tea can easily lead to the re-emergence of allergies, so that the condition recurs, causing laryngeal edema, and even life-threatening. Third, low blood pressure, low blood sugar, low blood lipids and debilitated patients, can not apply buckwheat tea for oral intake, otherwise it will lead to low blood pressure shock, low blood sugar hypoglycemia and some other dangerous situations.