A scan finding can be worrying, but it is not a diagnosis of cancer or a complete explanation for pain or bleeding. Your clinician will match the finding to your symptoms and history, then explain whether observation, follow-up, specialist assessment or another route is appropriate.
What is an ovarian cyst?
An ovarian cyst is a fluid-filled sac that develops on an ovary. NHS says ovarian cysts are very common and do not usually cause symptoms. Many occur naturally and go away within a few months without treatment.[1]
RCOG describes simple cysts, which contain fluid, and more complex cysts, which may contain thicker fluid, blood or solid areas. Before menopause, common cysts include simple cysts, endometriomas linked with endometriosis, and dermoid cysts. The description helps clinicians decide whether further assessment is needed.[2]
Functional cysts
These develop as part of the menstrual cycle and are the most common type. NHS says they are usually harmless and short-lived.
Cysts linked to endometriosis
Endometriosis can cause ovarian cysts called endometriomas. Symptoms and fertility plans need an individual discussion.
Dermoid and other cysts
Some cysts develop from other ovarian cells. Their management depends on the appearance, size and symptoms.
Simple and complex findings
A description of simple or complex guides the next step. It does not replace clinical assessment.
Symptoms and reasons to seek advice
Many cysts are found incidentally and cause no symptoms. When symptoms occur, NHS lists pelvic pain, pain during sex, difficulty emptying the bowels, needing to pass urine more often, bloating, feeling full quickly, altered periods and difficulty getting pregnant.[1]
These symptoms overlap with many gynaecological and non-gynaecological conditions. They do not prove that a cyst is the cause. Arrange an assessment if the symptoms persist, change or affect your daily life.
Acute pelvic or abdominal pain needs urgent advice
NHS advises an urgent GP appointment or NHS 111 for sudden severe pelvic pain, or abdominal pain with nausea or vomiting. Call 999 for a life-threatening emergency. If you are unsure whether 999 is needed, NHS says to use NHS 111.[1][5]
How clinicians assess a suspected cyst
An assessment starts with the question that needs answering. No fixed bundle of tests suits every person with pelvic symptoms or a scan finding.
Your symptoms
Pelvic pain, pain during sex, bloating, bowel or urinary changes, altered periods and feeling full quickly can shape the clinical question.
Your history
Your age, menopausal status, pregnancy possibility, period pattern, contraception, previous imaging and relevant family history help determine the route.
Ultrasound findings
Ultrasound may describe whether a cyst appears simple or complex and its relationship to nearby structures. A scan result needs clinical context.
Next steps
Depending on the picture, a clinician may advise no treatment, follow-up imaging, further tests, specialist review or another assessment pathway.
RCOG says clinicians usually ask about periods, pelvic pain, sexual health, contraception and relevant family history. An abdominal examination and, where appropriate, an internal examination may also form part of the assessment.[2]
If a clinician suspects a cyst, ultrasound may be used to look at the ovaries. RCOG says an abdominal scan and a vaginal scan may be offered before menopause. You can ask questions about the reason for the examination and give or withhold consent for an internal scan.
What ultrasound can and cannot show
A pelvic ultrasound can help show whether there is a cyst, its size and appearance, and whether it seems to arise from the ovary. It can provide useful information for a gynaecology assessment.[1][2]
An ultrasound result does not establish every diagnosis or explain every symptom. If a scan suggests a complex cyst, a clinician may recommend relevant blood tests or specialist assessment. NHS notes that a raised tumour marker alone does not mean someone has cancer, as non-cancerous conditions can also affect the result.[1]
Use the report as part of the clinical discussion. Ask what the finding may mean, what remains uncertain, whether follow-up is proposed and which symptoms should prompt earlier help.
Monitoring and management
Management depends on the cyst’s appearance and size, your symptoms, and whether you have been through menopause. NHS says many cysts disappear within a few months, while some need repeat imaging or specialist assessment.[1]
RCOG says small simple cysts before menopause often need no treatment, while symptoms or a large or complex finding may lead to hospital review. If treatment is discussed, your clinical team should explain the options, benefits and risks for your situation.[2]
After menopause, the approach may differ because the risk context changes. RCOG’s 2025 update says a unilateral, unilocular simple cyst of 3 cm or less found on imaging does not require routine follow-up in postmenopausal women. Other findings still need an individual plan.[3]
Ovarian cysts do not usually prevent pregnancy, according to NHS, but they can sometimes make conception harder. If you are trying to conceive, or surgery has been raised, discuss your priorities and the possible effect of each option with the relevant clinician.[1]
Related gynaecology information
These pages can help you prepare for a focused discussion. They do not replace assessment for new or worsening symptoms.
Questions to take to an appointment
Could a cyst account for my symptoms, or do I need another assessment?
What features did the scan describe, and what do they mean in my situation?
Would a repeat scan, test or specialist referral change the next step?
How does menopause status affect the follow-up plan?
Could the proposed plan affect fertility or pregnancy planning?
Which symptoms mean I should seek help before the next appointment?
Frequently asked questions
What is an ovarian cyst?
An ovarian cyst is a fluid-filled sac that develops on an ovary. NHS says ovarian cysts are common and do not usually cause symptoms.
Does an ovarian cyst mean cancer?
Most ovarian cysts are non-cancerous. The clinical team considers symptoms, age, menopausal status and scan features when deciding whether further assessment is needed. NHS notes that cancerous cysts are more common after menopause.
Will I need a pelvic ultrasound?
If a clinician suspects an ovarian cyst, ultrasound may help assess it. RCOG explains that an abdominal scan and a vaginal scan may be offered before menopause. The choice depends on the clinical question and your consent.
Can an ultrasound tell what is causing my symptoms?
An ultrasound can describe the ovaries and a cyst’s features, but it cannot explain every symptom or establish every diagnosis alone. A clinician interprets the result with your symptoms, history and any other relevant information.
Will I need follow-up?
Follow-up depends on your symptoms, menopausal status, and the cyst’s size and appearance. NHS says some cysts are monitored with a repeat ultrasound, while RCOG’s postmenopausal guidance states that some small simple cysts do not need routine follow-up. Your clinician should explain the plan for your situation.
Can an ovarian cyst affect fertility?
NHS says ovarian cysts do not usually prevent pregnancy, although they can sometimes make conception harder. Ask for an individual discussion if you are trying to conceive or have been advised to consider surgery.
When is pelvic pain urgent?
NHS advises urgent GP assessment or NHS 111 for sudden severe pelvic pain, or abdominal pain with nausea or vomiting. Call 999 for a life-threatening emergency, or use NHS 111 if you are unsure which service you need.