Stomach diseases do not cause premature heartbeat. Stomach diseases are mainly characterized by stomach pain, nausea, vomiting, acid reflux, belching, and indigestion, and common diseases include gastritis, gastric ulcer, gastric ptosis, and gastric cancer, etc. The occurrence of premature heartbeat is mainly caused by diseases in the heart, such as myocarditis, coronary heart disease, and mitral valve disease. Premature heartbeat is mainly caused by heart diseases, such as myocarditis, coronary heart disease, mitral valve lesions, etc. These diseases have little relation with stomach diseases, so stomach diseases will not lead to the onset of premature heartbeat. When premature heartbeats occur, you should go to the hospital as soon as possible for an electrocardiogram (ECG) to help confirm the diagnosis of the disease without having to be examined for stomach disorders. Patients who have already had premature heartbeats should be treated as soon as possible, as premature heartbeats can be life-threatening if left untreated.