Swelling in the 5th month of pregnancy may be caused by hormonal effects, increase in blood volume, hypertension during pregnancy and so on. 1. Hormonal effects: 5 months pregnant due to the hormones secreted by the placenta, adrenal aldosterone secretion increases, promote the reabsorption of water and sodium in the kidneys, resulting in the body of sodium retention, pregnant women will feel bloated. 2. Increase in blood volume: 5 months pregnant is the mid-pregnancy stage, with the increase in pregnancy weeks in the body’s blood volume will gradually increase, intravascular fluid leakage of blood vessels, accumulation in the interstitial space of the tissues will cause tissue edema, pregnant women will also have a feeling of bloating. 3. gestational hypertension: 5 months pregnant with gestational hypertension patients, will lead to glomerular dilatation, glomerular filtration rate decreases, renal tubular reabsorption of sodium increased, resulting in water and sodium retention, there will be a feeling of bloating. There are more reasons for bloating in the 5th month of pregnancy, accompanied by other discomforts to go to the hospital to check the cause.