The symptoms of pain during the contraction of the stomach are considered to be due to inflammation of the peritoneum or inflammation of the abdominal muscles. The abdominal muscles and peritoneum are more active when the patient’s abdomen contracts inward, and if there is some abdominal inflammation at this time, such as acute chronic pelvic inflammatory disease, acute cholecystitis or inflammation of the peritoneum caused by appendicitis, the pain will occur. In addition, the inward contraction of the patient’s abdomen will stimulate the intestinal tract and may cause intestinal disorders leading to pain, such as acute or chronic gastroenteritis, and patients with gastrointestinal tract dysfunction or intestinal spasm may also experience increased abdominal pain. If there is a tumor in the abdomen, especially a malignant tumor, inward contraction of the abdomen may also stimulate the tumor to produce painful aggravation of the symptoms. These are some of the reasons why it hurts when the abdomen contracts. It is recommended that patients with the above symptoms should go to a regular hospital for examination and clear diagnosis in a timely manner.