Back pain in five months of pregnancy, may be due to physiological factors, may also be lumbar disc herniation, lumbar spine hyperplasia and other pathologic factors lead to common causes and treatments are as follows: a physiological phenomenon 1, joint ligament discomfort: five months of pregnancy, due to changes in hormone levels, the whole body joint ligaments laxity, the stomach is also significantly larger, the weight increases, resulting in the ligaments of the back by gravity pulling, thus Symptoms of back pain. Pregnant women should pay attention to rest, ensure sufficient sleep, avoid strenuous activities, avoid exertion, to relieve the symptoms of pain; 2, lack of calcium: five months of pregnancy, the growth of the fetus is faster, the demand for calcium is more, which may lead to pregnant women with a lack of calcium, which can cause low back pain. You can take appropriate calcium supplement under the guidance of your doctor, such as calcium carbonate granules, and it is recommended to eat more food with high calcium content, such as milk, dairy products, shrimp, kelp, sesame paste, soy products, etc., and take appropriate calcium supplements and get more sunshine to promote the absorption of calcium. Second, the pathological phenomenon 1, lumbar intervertebral disc herniation: five months of pregnancy, with the growing fetus, the stomach is obviously bulging, the lumbar spine to withstand a gradual increase in pressure, which in turn leads to lumbar intervertebral disc herniation, pregnant women can be manifested as severe back pain. This situation needs to go to the hospital in time, relevant examination, clear cause, targeted treatment. Pregnant women should pay attention to rest in the near future, avoid strenuous activities and overwork, do not get cold, you can adhere to the daily local hot water bag or salt bag for hot compresses, and with some physical therapy methods, such as acupuncture, baking, cupping, etc., is conducive to improving the clinical symptoms of lumbar disc herniation in pregnant women; 2, cardiovascular system diseases: five months pregnant if there is myocardial infarction or arterial entrapment rupture, it will be manifested as back pain, accompanied by chest tightness, pain, respiratory pain. Accompanied by chest tightness, chest pain, dyspnea and other discomforts, need to seek medical attention as soon as possible, timely treatment; 3, digestive system diseases: five months of pregnancy, such as pancreatitis, cholecystitis, will be manifested as back pain, need to go to the hospital for treatment, such as intramuscular injection of atropine, to alleviate the spasm of the tissue, thereby relieving pain; 4, urinary system diseases: five months of pregnancy, if the presence of urinary stones, in addition to urinary anomalies, will usually accompany the symptoms of lumbar pain. The symptoms of lumbar pain, you can drink more water to promote the discharge of stones, if the pain is severe, intramuscular buclizine to relieve pain, with atropine, to relieve spasms, but also the use of diclofenac sodium to reduce urethral edema and promote stone discharge. Pregnant women should pay attention to supplemental nutrition during pregnancy, avoid standing for a long time, do not stay up all night, and avoid sleeping in damp places. Do not bathe or wash your feet in cold water immediately after sweating to prevent wind, dampness and cold from damaging the joints.