The reason for lumbar pain when sitting for a long time is twofold: First, because the process of sitting for a long time causes the lumbar muscles and ligaments to be in a continuous state of tension and fatigue, and local strain, after the formation of strain will produce more inflammatory metabolites, the accumulation of metabolites will increase, inflammatory edema will be formed locally, the peripheral nerves will be stimulated, there will be a clear lumbar when getting up again The pain symptoms are obvious when you get up again, and the muscle force will produce further strain and stimulation on the inflammatory lesion when you get up, so the pain symptoms are more obvious. Second, it is due to cold, because when sitting for a long time, the waist often lack of clothing cover, it will lead to a drop in local temperature, the muscles become more tense, blood circulation slows down, leading to further accumulation of metabolites, will also intensify the inflammatory edema. After this situation, it is necessary to let the waist relax and rest, try to choose a flat position, under the bilateral thighs with soft pillows, keep the hip flexion, knee flexion, can help the muscle relaxation, waist warmth can not appear cold, you can try to use a warm water bag hot compress, help improve blood circulation, promote venous reflux to reduce symptoms.