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An ovarian cyst is a fluid-filled sac on or in an ovary. Most are entirely normal. Every month a follicle grows to release an egg, and if it does not rupture or does not shrink afterwards, what remains is a cyst. These are called functional cysts, they are a by-product of ovulation working, and they usually disappear on their own within two or three cycles.
The reason this page exists is that the word "cyst" causes a level of alarm the finding rarely deserves — and the alarm is often made worse by well-meaning follow-up.
A simple cyst under 5cm in a woman who has not been through the menopause needs no follow-up scan at all. That is the formal guidance, and it is worth knowing before you spend six months waiting for a repeat appointment.
Three things do change the picture and are worth understanding:
And one clarification that saves a great deal of confusion: PCOS is not a cyst condition. The "cysts" in polycystic ovaries are ordinary follicles, and nothing about that diagnosis is related to the cysts described here.
Most ovarian cysts are found by accident on a scan done for something else, and cause no symptoms whatsoever. That is the normal situation, not a lucky escape.
A cyst bursting causes sudden sharp one-sided pain, which often eases over hours to a day or two. Most ruptures need nothing more than pain relief. Occasionally there is significant internal bleeding, which is why sudden severe pain with dizziness, a racing heart or feeling faint needs emergency assessment.
The ovary twists on its blood supply, most often with a cyst larger than about 5cm:
Not sudden pain, but persistence — which is precisely why it gets overlooked:
Symptoms present on most days for three weeks or more — particularly over 50 — need assessment, not an IBS label.
Both are part of ovulation working, both are extremely common in women who ovulate, and both usually resolve within two or three cycles without anything being done.
The combined pill and other methods that suppress ovulation reduce the formation of new functional cysts. Note the wording — they prevent new ones. They do not shrink a cyst you already have, which is a long-standing and still-repeated misunderstanding.
Protective: pregnancy, breastfeeding, and long-term combined pill use, which reduces ovarian cancer risk substantially and for years after stopping.
An ovarian cyst is diagnosed by ultrasound. What we do remotely is decide who needs one, arrange it, and — the part that matters most — interpret it properly afterwards.
Transvaginal ultrasound gives far better detail than an abdominal scan and is the test of choice. We refer for it. What the report should describe: size, whether it is simple or has solid areas, septations or blood flow, and whether there is free fluid.
Worth being clear about, because this test causes considerable unnecessary fear:
We use it in that context, and we explain the result rather than handing over a number.
We cannot examine you or scan you. Sudden severe pain needs to be seen the same day, not scanned next week — torsion is diagnosed and treated surgically, and the clock matters.
A simple cyst in a woman who has not been through the menopause usually needs nothing at all. Under 5cm, no repeat scan is required. Larger ones get one repeat scan rather than an open-ended series.
The most useful thing we do here is often to explain that: a great many women are left anxious for months by a finding that required no action, and nobody told them so.
The combined pill, the coil and other ovulation-suppressing methods prevent new functional cysts from forming. They do not shrink one you already have. Being clear about that avoids the common disappointment of taking the pill for three months and finding the cyst unchanged.
Where recurrent functional cysts are causing repeated pain, suppression is a sensible strategy and we can prescribe it.
Endometriomas do not resolve on their own, and the treatment is the treatment for endometriosis — hormonal suppression, pain management and, where needed, specialist surgery.
One counselling point that is frequently omitted: surgically removing an endometrioma reduces ovarian reserve. If you may want children, that trade-off deserves discussing with a specialist before anyone operates — not afterwards.
Referred to gynaecology, not managed here:
Most operations are keyhole and remove the cyst while preserving the ovary.
Go to A&E immediately for:
Seek same-day advice for:
Arrange an urgent appointment for:
Book a routine consultation for:
Functional cysts are a normal by-product of ovulating, so there is nothing to prevent and nothing you did. Suppressing ovulation — the combined pill, the implant, the hormonal coil, the injection — reduces how often new ones form, which is worth considering only if they are recurring and causing pain.
A simple diary of pain, bloating, appetite and cycle day. It distinguishes cyclical pain — which points to ovulation or endometriosis — from persistent daily symptoms, which are the pattern that matters. Take it to your appointment; it is more useful than trying to remember.
They are vague individually, which is exactly the problem. What matters is persistence — present on most days for three weeks or more:
If you have been given an IBS diagnosis for the first time over the age of 50, that warrants a second look rather than acceptance — IBS rarely starts at that age.
Tell us about ovarian, breast, bowel or womb cancer in close relatives, particularly at younger ages. It can change what you are offered, including referral for genetic testing, and it is the piece most often not mentioned because nobody asked.
Ovarian cysts are extremely common and the overwhelming majority are harmless. Finding one on a scan is usually an incidental observation about an ovary doing its job, not the beginning of a problem.
Most ovarian cysts are normal, physiological, and disappear on their own within a few menstrual cycles. They are extremely common, frequently found incidentally on a scan done for something else, and the usual correct management is a repeat scan rather than any intervention.
NHS care covers everything here free — ultrasound, blood tests, gynaecology referral and surgery where genuinely needed.
The most valuable thing a consultation does is prevent unnecessary alarm and unnecessary surgery. A simple cyst in a premenopausal woman is almost always benign, and the CA125 blood test — which people often ask for — is raised by endometriosis, fibroids, infection, menstruation and pregnancy, so in premenopausal women it produces a great many false alarms. It is not a screening test and using it as one causes harm.
Where private care is worth paying for is speed of a scan when a cyst has been found and you are waiting anxiously, and a proper explanation of what the report actually means.
What needs emergency assessment rather than a scan appointment: sudden severe one-sided pelvic pain, particularly with nausea or vomiting. Ovarian torsion is a surgical emergency and the ovary can be lost through delay.
A cyst found after the menopause is assessed differently and warrants prompt gynaecology input.
RCOG Green-top Guideline No. 62, Management of Suspected Ovarian Masses in Premenopausal Women, is the principal UK reference. It recommends conservative management with repeat ultrasound for simple cysts under 5cm, which usually resolve spontaneously.
RCOG Green-top Guideline No. 34 covers ovarian cysts in postmenopausal women, where the threshold for investigation and referral is lower and the Risk of Malignancy Index is used to guide management.
NICE CG122, Ovarian cancer: recognition and initial management, sets out CA125 testing in symptomatic women and is explicit that CA125 is not a screening test and is elevated by numerous benign conditions.
The UK National Screening Committee does not recommend ovarian cancer screening, following trial evidence that it does not reduce mortality.
RCOG guidance identifies ovarian torsion as requiring emergency surgical assessment, underpinning the urgent features above.
Usually not at all. Most are functional cysts — a normal by-product of ovulation — and they resolve on their own within two or three cycles. The word "cyst" carries far more alarm than the finding generally deserves. What changes the picture is a cyst found after the menopause, one with complex features on the scan, or persistent daily symptoms.
Often not. A simple cyst under 5cm in a woman who has not been through the menopause needs no follow-up scan at all — that is the formal guidance. Between 5 and 7cm, one repeat is reasonable. Larger or complex cysts, and any cyst after the menopause, do need proper assessment.
No — and this is a persistent misunderstanding. The combined pill and other ovulation-suppressing methods prevent new functional cysts forming; they do not shrink one that already exists. They are worth using if you keep getting painful ones, not as a treatment for the cyst you have now.
No, despite the name. The "cysts" in polycystic ovaries are ordinary immature follicles, not cysts in the sense described here, and PCOS is a hormonal and metabolic condition. Having one tells you nothing about the other.
Not as a general check. CA125 is not a screening test: it is raised by endometriosis, fibroids, infection, periods, pregnancy and liver disease, and it is normal in around half of early ovarian cancers. Used alone it produces a great deal of fear and false reassurance in roughly equal measure. It is useful alongside a scan and your menopausal status, in a proper risk assessment.
Functional cysts do not. Endometriomas can, as part of endometriosis. The point most often missed is the other direction: surgery to remove an endometrioma reduces ovarian reserve. If you may want children, that trade-off needs discussing with a specialist before an operation is agreed, not after.
Sudden sharp pain on one side, usually easing over hours to a day or two, sometimes with light bleeding. Most ruptures need nothing beyond pain relief and a heat pad. Get emergency help if there is dizziness, faintness or a racing heart, which can mean significant internal bleeding.
Sudden, severe, one-sided pain with nausea and vomiting — often coming in waves, sometimes after sudden movement. It is more likely with a cyst over about 5cm. This is a surgical emergency: the ovary can be saved if it is untwisted quickly and lost if it is not, so go to A&E rather than waiting.
Worth revisiting, particularly if you are over 50 or the symptoms started recently. Ovarian cancer causes bloating, early fullness, pelvic pain and urinary urgency — and is regularly labelled IBS. The distinguishing feature is persistence: present most days for three weeks or more, rather than fluctuating. That deserves a scan and a CA125 in context, not another antispasmodic.
August 23, 2026
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