Hot water bag on the waist has to promote blood circulation in the waist, relieve pain and other benefits. 1. Promote blood circulation: hot water bag on the waist can increase the local temperature, resulting in vasodilatation, to achieve the benefits of promoting blood circulation in the lumbar region, but also be able to make the lumbar muscles, ligaments and other soft tissues are in a state of relaxation, to improve the lumbar muscle tension. 2. Pain relief: hot water bag compress is a kind of physical therapy, through the role of heat can also promote the metabolism of inflammatory metabolites, improve the accumulation of inflammatory metabolites in the body, relieve the symptoms of lumbar pain. Note that the hot water bag lumbar time can not be too long, if you need to be guided by a doctor to regulate the treatment of discomfort, do not blindly trust rumors, prescriptions, so as not to cause serious adverse consequences.