Heartburn in pregnant women at night may be caused by gastroesophageal reflux, which can be neutralized by choosing to lie on the left side of the bed or taking oral sodium bicarbonate tablets. Pregnant women may have heartburn during pregnancy due to the increasing growth and development of the fetus, which elevates the diaphragm and causes the stomach to slow down its downward emptying, and finally triggers acid reflux. Or eating too many sweets, strong progesterone secretion and excessive estrogen in the body may cause acid reflux and heartburn. For these cases, you can choose to sleep on the left side of the bed to promote gastric emptying, and at the same time need to pay attention to nutritional balance, reduce the intake of high-sugar foods. If these symptoms cannot be resolved quickly, you can go to the hospital and use medication that can neutralize stomach acid, such as sodium bicarbonate tablets, according to your doctor’s instructions.