37 weeks of pregnancy waist especially soreness belongs to the normal situation, is the uterus enlargement oppression of the surrounding tissues caused by. But there is also the possibility of suffering from lumbar muscle strain, lumbar disc herniation and other diseases. 1. Normal situation: in 37 weeks of pregnancy, due to the larger fetus, the enlarged uterus will compress the surrounding organs and tissues, some pregnant women will feel particularly sore waist, is a normal situation. 2. Lumbar muscle strain: Lumbar muscle strain is the pain caused by soft tissue injuries such as lumbar muscles and ligaments, which manifests as lumbar discomfort and limited activities, etc. The etiology of the disease is related to the unhealed acute injuries, chronic inflammatory reactions, and sedentary and prolonged standing. 3. Lumbar intervertebral disc herniation: lumbar intervertebral disc herniation is mainly caused by degeneration of the intervertebral disc, accumulation of injuries, pregnancy, genetic factors will also increase the chances of lumbar intervertebral disc herniation, the patient will have lumbar pain, lumbar acidity, numbness of the lower limbs and other symptoms. There are more reasons why the waist is particularly sore in 37 weeks of pregnancy, so it is recommended to consult a doctor for examination and a clear diagnosis.