Heartburn symptoms in the 5th month of pregnancy are due to gastroesophageal reflux caused by excessive secretion of stomach acid. Heartburn is a burning sensation behind the sternum, often extending upward from the lower part of the sternum. If you have been experiencing heartburn symptoms from the beginning of pregnancy until now in the 5th month of pregnancy, it is a pregnancy reaction that causes excessive stomach acid. After pregnancy, due to the influence of hormones, the peristalsis of the gastrointestinal tract slows down, the secretion of gastric acid increases, and the cardia sphincter of pregnant women is relaxed, making them prone to symptoms of gastroesophageal reflux. If the pregnancy reaction has ended before, and now the heartburn symptom suddenly appears again in the 5th month of pregnancy, it may be caused by eating food that is not easy to digest. Pregnant women can take oral Bifidobacterium triptans capsules to promote digestion and reduce the symptoms.