The left side of the stomach pain after the menstruation needs to be treated in a timely manner: first, stomach pain may be due to the emergence of dysmenorrhea, appropriate rest can be, usually can drink more warm water, can relieve the symptoms of dysmenorrhea, it is best not to overstress. If the dysmenorrhea is strong, it is best to take pain medication for treatment, such as ibuprofen, you can also choose to take diclofenac, meclofenac for treatment, which can inhibit the synthesis of prostaglandins and relieve the symptoms of dysmenorrhea; second, if it is caused by other diseases, such as pelvic inflammatory disease, tubitis and other problems, it is best to go to the hospital for gynecological ultrasound and pelvic CT examination, through the examination to determine the body disease The first is to see if there are any adnexal lesions, and then to carry out symptomatic treatment. When there is an inflammatory reaction or physical lesions appear, it is best to use medication to regulate the treatment in time.