The symptoms of acidity in the mouth are usually caused by reflux esophagitis, slowed gastrointestinal function and liver and gallbladder disease. 1, if it is caused by reflux esophagitis, it is recommended to take oral acid-suppressing drugs, such as mosapride and omeprazole. 2, if it is a liver and gallbladder disease, it is necessary to check the liver function to clarify the cause and then treat the symptoms. Note that you should not take drugs indiscriminately to avoid the impact of drugs on the fetus.