Indigestion and heartburn are symptoms that are very common in pregnancy. If you’re pregnant, you have an 8 in 10 chance you will experience these symptoms at some point in your pregnancy. Indigestion, also called 'dyspepsia', is a feeling of pain or discomfort in your stomach . This mostly occurs after eating or drinking. Heartburn, also known as reflux, is a burning pain in your stomach or chest going up towards your throat. It’s caused by stomach acid coming up your oesophagus (the tube that connects your mouth to your stomach). The acid irritates the lining of your oesophagus. Sometimes food might come back up from your stomach into your mouth. You might also notice a bitter taste in your mouth.