The causes of back pain and stomach pain in the fourth month of pregnancy are divided into a variety of reasons: first of all, you should pay attention to observation and differentiation, if the pain is not serious, pay attention to bed rest, pay attention to warmth, avoid eating more stimulating food, because stomach pain is particularly obvious when it can cause back pain, is pulling, for example, during pregnancy due to cold or improper diet, resulting in gastrointestinal disorders, will appear back pain and stomach pain symptoms. Secondly, when there is stomach pain and lumbar pain is more serious, we should consider that there is a phenomenon of pre-eclampsia, also need to pay attention to absolute bed rest, pain is obviously aggravated, promptly go to the hospital for ultrasound examination. Then, if there is only a mild stomach pain and back pain, it is a physiological manifestation and does not require excessive examination.