The science of bloodletting under the tongue is somewhat controversial at present. Bloodletting under the tongue is a diagnostic and therapeutic treatment in traditional Chinese medicine, which has a certain effect of activating blood circulation and removing blood stasis, but it has a certain damage to the tongue tissues. Bloodletting under the tongue is one of the bloodletting therapies in Chinese medicine, which refers to the use of a needle tool to puncture the jinjin and yuyi acupoints to make them release a small amount of blood, which has a certain effect of activating blood circulation and removing blood stasis, and can be clinically used to alleviate the symptoms of vertigo, insomnia, and intractable migraine headache. Pricking the vein under the tongue during treatment may cause localized blood stasis and the formation of hematoma, which is damaging to the tongue tissues and leads to the occurrence of symptoms such as pain when eating. Pregnant women and menstruating women are forbidden to use acupuncture to release blood, so as not to cause excessive menstrual flow or miscarriage. This method is only applicable to a small number of patients, the specific operation needs to be carried out by a professional doctor, do not operate on your own.