Hiccups and acid reflux are considered to be caused by functional dyspepsia. When functional dyspepsia occurs, the digestive tissues become less functional and the bacteriophageal circle becomes dysfunctional, and some of the food that is not decomposed and transformed in a timely manner becomes overly fermented with harmful flora, resulting in a large amount of belching. The diaphragm is stimulated by changes in air pressure and gastric acid, which induces contractile spasms, resulting in frequent belching, acid reflux, and heartburn. The possibility of other conditions such as superficial gastritis, reflux esophagitis, duodenal ulcer, etc. cannot be ruled out. If the adverse symptoms persist or worsen, early treatment at a hospital is required.