Lumbar pain in the past few days, this situation is usually due to strain and cold caused by: first, in the strain is mainly due to the lumbar sustained exertion, such as sedentary, squatting, standing, as well as often bending down to lift heavy objects, etc., to maintain a posture for too long, which is likely to lead to lumbar muscles and ligaments and other soft tissues are overly fatigued and strain. Inflammatory metabolites and metabolites such as lactic acid will be produced locally, which may stimulate the peripheral nerves, and thus localized pain will occur. Secondly, due to the cold in the waist, because the cold in the waist will lead to the muscle tissue become very tense, blood circulation will also have vasoconstriction caused by the decline. Therefore, it will lead to a reduction in the local arterial blood supply, the venous return is also slowed down, so there will be an increase in the accumulation of local metabolites, so it will produce the symptoms of soreness and pain more obvious. Therefore, after the occurrence of this situation need to keep the waist relaxed, avoid maintaining a position for too long. Try to choose the flat position to rest, and then pay attention to keep warm, do not get cold. The application of warm water bags for hot compresses can effectively relieve.