After the end of menstruation small stomach vaguely swelling pain need to pay attention to, leading to the emergence of this symptom has the following reasons: 1, endometritis, pelvic inflammatory disease triggered, in the menstrual period of the body’s resistance is poor, bacteria or viruses invade after the retrograde infection is prone to enter the uterus and pelvic cavity through the cervix, which triggered inflammatory reaction, so it will produce the symptoms of the vague pain in the stomach. 2, coitus, coitus, during the greater strength, to the uterus produce stimulation and pain symptoms can basically do not need to be treated. The pain symptom that occurs when the uterus is stimulated during the period of greater strength can basically not be treated. 3, there may be other gynecological diseases, such as malignant tumors or adnexitis and other diseases, but also other systemic diseases, such as gastrointestinal diseases, etc., it is recommended to go to the hospital in a timely manner to carry out an examination, and according to the condition of the symptomatic medication.