Can anyone help me with understanding how the symptoms of these two conditions differ? My 13 year old daughter has been diagnosed with IBS albeit her pain started with a hemorrhagic cyst which was seen by ultrasound. The cyst which was 5cm in size burst naturally but her pain and nausea continues. We have been passed from the gynae consultant to a pediatric consultant hence the diagnosis of IBS and the belief that the cyst was just a red herring. I am struggling to believe this as when her periods are due, she is crippled with pain and has swelling in her lower abdomen. Any help gratefully received.