It is relatively common to see the phenomenon of returning blood when giving a hangman’s injection. For the treatment of bleeding back, it needs to be dealt with according to the length of the bleeding back time. If the bleeding back time is short, it is enough to squeeze the blood back directly within a minute. If more than a minute, the blood will appear clotted, you must pull out the needle and re-tie the needle, otherwise it will affect the normal hanging water. Do not panic when the blood is back in the drip, the drip process should be careful to put the bottle at a certain height, the height is not enough will also lead to blood backflow, there will be back blood phenomenon. Do not move during the hanging process, as well as do not compress the proximal end of the infusion vessel, the vessel is compressed will also lead to blood reflux obstruction, the pressure inside the vessel will lead to blood reflux into the infusion tube. The occurrence of reflux should also pay attention to change the posture, incorrect posture will also lead to the drug does not drip, a long time will appear reflux phenomenon. Pay attention to observation during the hanging process, the medicine should be replaced in time after the drip, no continuity of the medicine will also appear the phenomenon of reflux.