Symptoms of PMS (premenstrual syndrome), such as abdominal pain, can come and go. The important thing is start pain relief early and to take it regularly. Non steroidal anti inflammatory drags (NSAIDs) are the most helpful as period pain is an 'inflammatory' process. Try something like Nurofen or Naprogesic and make sure you take it on a full stomach, but talk to your pharmist first. Start at the first sign of period pain and continue for the first 1-2 days of your period. Sometimes a hot water bottle can help when you're at home and exercise is also very helpful to reduce pain. If the pain is still really bad after trying this, please see your Dr.