There are several possible causes for pain when pressure is applied to the small stomach: First, it may be due to spasmodic pain in the intestine caused by acute gastroenteritis, and pain may also occur when pressure is applied. Second, it may be due to intestinal obstruction caused by a tumor in the intestine, as well as pain caused by tumor compression, which is more obvious especially when pressed. Third, it may be caused by diseases of the bladder, such as cystitis and tumors of the bladder, which appear to be painful when pressed. Fourth, pain on pressure in the belly may also be due to pelvic effusion. Fifth, in the case of women, it may also be due to gynecological related diseases. If you have pain when you press on your belly, it is recommended that you go to a regular specialized hospital for systematic examination in a timely manner. After a clear diagnosis, timely and standardized treatment should be carried out.