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The following types of ovarian cysts are non-cancerous. It should be noted that a woman can develop more than one type.

Follicular - When a mature follicle collapses on itself, the process is known as involution, causing a follicular cyst. This is more likely to happen during ovulation than at other times. It can grow to a little more than two inches in diameter. When this type of ovarian cyst ruptures, it can cause severe ovary pain. Due to the fact that this discomfort often occurs during ovulation, it's sometimes called mittelschmerz or mid-pain. Pain is likely to occur in approximately one woman in four who has a follicular cyst. But follicular cysts usually disappear by themselves in a matter of a few months.

Corpus luteum cyst - When the follicle releases an egg, the egg becomes known as a corpus luteum, meaning yellow body. The role of the corpus luteum is to help produce hormones which are critical to becoming pregnant. When pregnancy doesn't occur, the corpus luteum breaks down and disappears. But there are times when the corpus luteum stays in the ovary and fills with blood. Usually, this happens on only one side. There are no symptoms.

Hemorrhagic cyst - When bleeding occurs inside a cyst, it's defined as a hemorrhagic cyst. This type may cause ovary pain on one side of the body.

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