Small abdominal pain during menstruation may be dysmenorrhea, which can be examined and treated for the right cause in the hospital. Outside the menstrual period if it is obvious dull pain, consider gynecological diseases, such as tubitis, tubo-ovarian abscess, pelvic inflammatory disease, or other inflammatory diseases, such as lymphitis, colitis, adnexitis, etc. If the pain is chronic and hidden, the main consideration is inflammation of the left fallopian tube leading to abdominal pain, and gynecologic related examination should be performed in the hospital. It is also considered as intestinal disease, pay attention to diet to avoid spicy stimulants, observe if it improves, if not, it is recommended to go to the hospital for relevant detailed examination. It may also be due to long-term constipation, resulting in the accumulation of stool to stimulate the intestinal canal, resulting in vague pain in the left abdomen, you should drink more water or use medicine for defecation, observe whether the symptoms improve, if not, consider other diseases.