Belching (burping) acid reflux after taking omeprazole may be due to an adverse drug reaction, or it may be due to the disease itself, such as reflux esophagitis, chronic gastritis and so on. 1. Adverse drug reactions: Omeprazole is a proton pump inhibitor, some people can take diarrhea, nausea, abdominal pain, flatulence, constipation, belching, acid reflux and other gastrointestinal reactions, usually after stopping the drug can be improved. 2. Disease itself: Omeprazole is commonly used in the treatment of reflux esophagitis, chronic gastritis, peptic ulcer and other digestive diseases, these diseases themselves can have belching, acid reflux symptoms, so the treatment process is not yet fully recovered, belching, acid reflux symptoms. Need to continue to take omeprazole to inhibit gastric acid secretion, but also follow the doctor’s instructions to take domperidone and other to promote gastrointestinal power. Belching and acid reflux after taking omeprazole should go to the hospital to identify the cause and treat according to the cause.