A little pain under the stomach is the lower and middle abdominal area, generally may be caused by the following reasons: first, is the gastrointestinal tract response, such as gastrointestinal tract dysfunction, acute or chronic enteritis, or intestinal spasm, intestinal obstruction will appear in this area of pain. Second, there may be bladder or urinary system diseases, such as cystitis or urinary tract infection, usually accompanied by frequent, urgent, painful urination, and even some patients will also appear the symptoms of blood in the urine. Thirdly, if it is a woman, it may be a gynecological disease, such as inflammation of the uterine adnexa or pre-eclampsia, dysmenorrhea, endometriosis, etc., which may cause pain in this area.