The symptoms of left-sided back pain in the seventh month of pregnancy: 1. mainly depends on whether there is excessive activity and fatigue in the recent past. 2. it is also possible that the lumbar strain and urinary system problems are caused by stones in the left kidney area. 3. most commonly, the left-sided local pain is caused by the deformation of the lumbar spine due to the increasing size of the child in the seventh month of pregnancy. If this symptom occurs, you can gently massage the lumbar region, but do not exert too much force, so as not to lead to pre-eclampsia, when sleeping, you can partially put a pillow on the lumbar back to relieve the pressure on the lumbar region, and usually participate in appropriate outdoor activities and take more walks, which will help the production. If there is no relief within a short period of time, you must go to a regular hospital in time to improve the relevant examination and choose a more scientific and reasonable treatment method after the cause is clear.