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An ovarian cyst is a fluid-filled sac within the ovary. Often they cause no symptoms. Occasionally they may produce bloating, lower abdominal pain, or lower back pain. The majority of cysts are harmless. If the cyst either breaks open or causes twisting of the ovary, it may cause severe pain. This may result in vomiting or feeling faint.
Some or all of the following symptoms may be present, though it is possible not to experience any symptoms:
Other symptoms may depend on the cause of the cysts:
The effect of cysts not related to PCOS on fertility is unclear