The pain in the stomach like dysmenorrhea is considered to be caused by intestinal spasm, which can be seen after catching a cold, or improper diet or strenuous exercise, etc. The spasm of intestinal smooth muscle can be relieved by oral belladonna tablets or 654-2 injection. You may also be alert to abdominal pain caused by intussusception or intestinal obstruction, and you may have an abdominal plain film or ultrasound or CT examination to clarify the diagnosis. Very few patients may also have vascular lesions such as mesenteric artery or venous thrombosis, which may cause significant cramp-like abdominal pain, which is more serious and may cause intestinal necrosis and requires surgery.