Cysts may cause a lot of pain and discomfort, but not always. Most cysts are benign whether they are big/small, complex/functional. Don't worry too much :)
Oh, and it would be very helpful if you would fill out your profile . Treatments and diagnoses vary according to the age of the patient.
I'm sure a number of members will reply that have had complex ovarian cysts . No, they are not always cancerous. Actually they aren't that rare.