Heartburn is a burning or uncomfortable sensation behind the sternum or in the throat. It may be due to acid reflux into the throat and mouth, resulting in a sour and bitter sensation in the mouth. The cause of heartburn sensation during pregnancy is not known. It may be due to altered hormone levels in pregnancy, which affects the function of the gastrointestinal tract and leads to gastroesophageal reflux. Heartburn does not increase adverse pregnancy outcomes, so its treatment is symptomatic rather than preventative. Heartburn is a more common symptom during pregnancy, and its incidence increases with the number of weeks of pregnancy. What can be done to reduce acid reflux and alleviate the symptoms? Improve lifestyle habits: Eat smaller and more frequent meals. Avoid foods containing caffeine and other foods that stimulate acid secretion, especially after meals, and stay in a standing position, avoid lying down. If symptoms are severe and improving dietary habits is not effective, antacid medications can also be used. H2 receptor antagonists can reduce gastric acid secretion and effectively relieve heartburn and are safe for use during pregnancy. However, they should be used with caution.