The advantage of sublingual bloodletting therapy is that it has the effect of activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), and the disadvantage is that it may cause infection. 1. Advantages: Sublingual bloodletting mainly involves bloodletting to Yuyu acupoints and Jinjin acupoints, which can achieve the effect of activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), and is mainly suitable for stagnation of blood stasis caused by stagnation of veins and veins under the tongue, with blue and purple color, and accompanied by swallowing dysfunction and dysfunction of speech. 2. The downside: if food residue is left behind plus cleaning is not done properly, there is a risk of infection. In addition, if the patient is unconscious, the operation is more difficult, easy to damage the tongue. Must be in the operation of the professional doctor for treatment, can not operate on their own.