An ovarian cyst is a fluid filled sac that can one or both of your ovaries. These are very common and will often cause no symptoms. Most ovarian cysts will naturally go away after a few months and not require any treatment.
There are many different types of ovarian cysts that can be put in to two different categories
Functional - these cysts develop as part of the menstrual cycle
Pathological - These cysts form as a result of abnormal cell growth