It is common for pregnant women to experience back pain after 37 weeks of pregnancy. The possible causes of back pain are not exactly the same for different weeks of pregnancy. Pregnancy 37 weeks, already belongs to the full-term pregnancy, this time pregnant women appear back pain symptoms, the possible reasons mainly include:Because in the late stages of pregnancy due to the rapid development of the fetus, pregnant women are very easy to lack of a variety of nutrients and minerals, especially calcium, vitamins and iron and so on. Once the lack of, it is easy to cause lumbago and lumbago, when lumbago accompanied by leg cramps, pay attention to timely calcium treatment.