Chewing gum cannot be swallowed because it is mainly made of substances such as gum. If it is accidentally swallowed into the gastrointestinal tract, it is usually not digested by gastric or intestinal fluids and is usually excreted through the stool. If the ingredients inside produce harmful substances through absorption or mutation, absorption through the gastrointestinal tract may lead to gastrointestinal discomfort, and adverse reactions such as nausea, vomiting, bloating, abdominal pain, or diarrhea, and may lead to indigestion, resulting in constipation and other conditions. Therefore, it is generally necessary to spit out the gum after eating it and not to swallow it. If swallowed by children, it may cause indigestion or even serious intestinal obstruction.