The constant feeling of something moving in the stomach is related to acute gastroenteritis, irritable bowel syndrome, and parasitic infections. The intestine will excrete food by peristalsis when food enters the intestine, but the peristalsis is relatively slow and most people are unable to feel it. During acute IBS, some toxins and bacteria in the food irritate the mucous membrane of the intestinal wall, resulting in a faster peristaltic movement, which can be felt in the stomach, accompanied by diarrhea and bloating. Irritable bowel syndrome can cause various symptoms in the digestive system, and some people have the onset of the disease with the main symptom of increased peristaltic speed of the intestines, and these people can feel the peristaltic movement of the intestinal system. Roundworms and pinworms are parasitic in the intestines and absorb nutrients from the body through the intestinal wall. When there are too many parasites, they can cause certain irritation to the intestines and stomach, and some people can even feel something moving in their stomachs, especially when they are treated with deworming drugs, the parasites will increase their peristaltic movements due to drug stimulation.