Ovarian Cysts: Which Ones Are Harmless and Which Need Treatment

Most Ovarian Cysts Are Nothing to Fear

An ovarian cyst is a fluid-filled sac on or inside the ovary. The word "cyst" sounds alarming, but the large majority are functional cysts — a normal by-product of the menstrual cycle that forms and then disappears on its own within a few weeks.

So when a scan reports a cyst, the real task is telling a harmless one apart from the small number that need attention. Over more than 10 years across HSR Layout and Attibele, Dr. Sanjana L has reassured far more women about cysts than she has operated on — and the goal is always the least intervention that safely resolves the problem.

The Cysts That Are Usually Harmless

Functional cysts — follicular and corpus luteum cysts — form as part of ovulation. They:

• Are very common in women of reproductive age
• Usually cause no symptoms
• Typically resolve on their own within one to three menstrual cycles
• Need only a repeat scan to confirm they have gone

For these, the right response is reassurance and a short interval scan, not surgery.

The Cysts That Need a Closer Look

A cyst deserves more attention when it is:

• Large, or growing on repeat scans
• Persistent — still there after a few cycles
• Causing pain, pressure or bloating
• Showing complex features on ultrasound (solid areas, septations)
• Associated with conditions such as endometriosis (endometriomas) or, rarely, other growths

One situation is urgent: sudden, severe, one-sided pelvic pain can signal ovarian torsion (a twisted cyst) — this needs immediate medical care.

How Cysts Are Assessed

Assessment is straightforward: a symptom review, a pelvic examination, and an ultrasound to characterise the cyst. Where the scan warrants it, blood tests or tumour markers add information. Together these usually make it clear whether a cyst can simply be watched or needs treatment.

When Treatment Is Needed

When a cyst is large, persistent, twisted or symptomatic, treatment is usually a laparoscopic (keyhole) cystectomy that removes the cyst while preserving healthy ovarian tissue — protecting your future fertility. Open surgery is rarely required for straightforward cysts. You can read more on our ovarian cyst treatment page.

Cysts, PCOS and Fertility

Having "cysts" on a scan is not the same as having PCOS. In PCOS, the ovaries show many small follicles rather than a single significant cyst, and the condition is hormonal and metabolic. Most simple ovarian cysts do not affect fertility, though conditions like endometriomas can — which is another reason accurate assessment matters.

Frequently Asked Questions

Are ovarian cysts dangerous?

Most are functional and harmless and resolve on their own. A minority need treatment because they are large, persistent, painful, or have concerning features on a scan.

Will I need surgery for an ovarian cyst?

Often not. Simple cysts are usually just monitored with a repeat scan. Surgery — usually keyhole — is reserved for cysts that are large, growing, twisted or symptomatic.

Can an ovarian cyst affect my fertility?

Most cysts do not. Some linked conditions, such as endometriomas or PCOS, can affect fertility, which is why proper evaluation matters.

When is ovarian cyst pain an emergency?

Sudden, severe, one-sided pelvic pain — sometimes with nausea or vomiting — can indicate torsion (a twisted cyst) and needs immediate medical attention.

Consult Dr. Sanjana L

Dr. Sanjana L (MBBS, MS — OBG, Gold Medalist, FMAS) is a consultant obstetrician–gynaecologist and keyhole surgeon. If a scan has shown a cyst, a calm, accurate assessment usually settles the question quickly. Learn more about Dr. Sanjana, see her HSR Layout and Attibele clinics, or book an appointment.