Flashing the waist is what is called acute lumbar sprain in clinical practice. Acute lumbar sprain will cause severe pain in the waist, mainly because the patient bends down to lift heavy objects, causing disorder of lumbar facet joints. For this kind of acute lumbar sprain, the fastest clinical solution is acupuncture, which has an immediate effect on improving acute lumbar sprain. For acute sprain, acupuncture has two experience effective points, that is, 0.5 inch below the three li of the hand, which can be quickly relieved by acupuncture. If acupuncture is not available at this time, local massage or hot compress can be applied to the waist to relieve muscle tension. Hot compress and massage can also relieve muscle tension, but this process is relatively slow. You can also take oral drugs to promote blood circulation, dredge collaterals and relieve pain, such as mugua pills.