A week after the end of menstruation abdominal pain may be ovulation, may also be pelvic inflammatory disease, gastroenteritis and other diseases caused by the doctor’s instructions to take observation, medication and other ways of treatment. 1. Ovulation: a week after the end of menstruation, patients may enter the ovulation period, some patients in the ovulation, follicular fluid discharged into the pelvic cavity will appear small abdominal pain, in addition, can also be accompanied by vaginal discharge in the form of jelly, usually lasts for 2-3 days to relieve, without treatment. 2. Pelvic inflammatory disease: it can also cause abdominal pain a week after menstruation, and abdominal pain is mostly persistent, abdominal pain worsens after activity or sexual intercourse, and it can be accompanied by increased vaginal discharge, fever and so on. It can be treated with drugs such as ceftriaxone sodium, minocycline, levofloxacin, metronidazole, clindamycin and so on as prescribed by the doctor. Conservative treatment is ineffective, can be surgically excised lesions or drainage out of pus. 3. Gastroenteritis: one week after the end of menstruation, the patient’s gastroenteritis is caused by eating cold or unclean food, and there is pain in the lower abdomen, accompanied by diarrhea, fever, etc., which can be treated with levofloxacin, gentamicin and other medicines according to the doctor’s instructions. In addition, there are many other reasons that can cause abdominal pain a week after the end of menstruation, it is recommended that patients go to the hospital in a timely manner to identify the cause of the disease, and then receive treatment as soon as possible.