After experiencing pain initially thought to be gallstones, an ultrasound showed I have a 4.9cm ovarian cyst. A referral to a gynaechologist is only made if the cyst is larger than 5cm so my GP says it's fine to just leave it. I can't help feeling a bit worried. 4.9 cm sounds quite big to me. Also, what if it's more sinister than a cyst? Any experience or knowledge gratefully received. I've had a series of ailments of late and am getting a bit fed up with it all.