If left abdominal pain occurs after menstruation, care should be taken not to over-stress, to ensure sufficient rest and sleep, to exercise moderately and regularly in general, and to pay attention to quitting smoking. If the pain is unbearable, you can take appropriate medication for pain relief, such as scopolamine, atropine and methotrexate, but you need to consult a medical professional about their use and should not use them on your own.