Ovarian Cysts: When to Worry and When to Wait

Most Ovarian Cysts Are Nothing

Here is the first thing to know: if you are a premenopausal woman and you have ovaries, you make cysts every month. That is how ovulation works. A follicle grows, fills with fluid, reaches 2-3 centimeters, ruptures to release an egg, and collapses. This is a functional cyst. It is normal physiology, not pathology.

The problem arises when someone gets an ultrasound for another reason — maybe pelvic pain, maybe a routine scan — and hears "you have an ovarian cyst." Suddenly you are anxious, Googling worst-case scenarios at 2 AM. Let me walk you through what actually matters.

Types of Ovarian Cysts

Functional Cysts (Normal)

Follicular cysts: The follicle grows but does not rupture. It keeps filling with fluid, sometimes reaching 5-6 centimeters. These almost always resolve on their own within 1-3 menstrual cycles.

Corpus luteum cysts: After ovulation, the collapsed follicle (corpus luteum) sometimes fills with blood or fluid. These can cause one-sided pelvic pain and usually resolve within a few weeks.

Benign Pathologic Cysts (Usually Not Dangerous)

Dermoid cysts (mature teratomas): Contain tissue like hair, teeth, and fat. Sounds alarming but they are almost always benign. They do not resolve on their own and may need surgical removal if large.

Endometriomas ("chocolate cysts"): Filled with old blood from endometriosis. These indicate underlying endometriosis and may need treatment depending on symptoms and fertility goals.

Cystadenomas: Fluid-filled cysts that develop from the ovarian surface. Can grow large but are usually benign.

Concerning Cysts

Complex cysts with solid components: A mix of fluid and solid tissue raises concern for malignancy.

Cysts with abnormal blood flow on Doppler ultrasound.

Cysts that grow rapidly or persist after menopause.

When to Actually Worry

Size Matters (But Not the Way You Think)

A 3-centimeter simple cyst in a 30-year-old? Watch it. It will almost certainly resolve.

A 3-centimeter complex cyst in a 65-year-old? Evaluate further. Postmenopausal ovaries should not be making cysts.

General guidelines:

• Under 5 cm, simple, premenopausal: Watch and repeat ultrasound in 6-8 weeks
• 5-7 cm, simple, premenopausal: Monitor closely, may resolve
• Over 7 cm: Consider surgical evaluation regardless of appearance
• Any size with solid components: Needs further workup

Symptoms That Need Attention

Most cysts cause no symptoms. When they do, pay attention to:

• Sudden severe pelvic pain — possible cyst rupture or ovarian torsion (twisting). Torsion is a surgical emergency.
• Pain with fever — possible infection or ruptured cyst with peritoneal irritation
• Persistent bloating and early satiety — can indicate a large cyst or, rarely, ovarian cancer
• Irregular bleeding — functional cysts can disrupt your cycle
• Pain during intercourse — suggests a cyst is pressing on surrounding structures

Red Flags for Ovarian Cancer

Ovarian cancer is rare, especially in young women, but these features raise concern:

• Postmenopausal cyst (any type)
• Solid components within the cyst
• Ascites (fluid in the abdomen)
• Elevated CA-125 (tumor marker — though this is not specific and is elevated in many benign conditions)
• Bilateral complex cysts
• Rapid growth on serial imaging
• Family history of ovarian or breast cancer (especially BRCA mutations)

Diagnosis and Workup

Ultrasound

The primary tool. Transvaginal ultrasound can characterize most cysts as simple (fluid-filled, thin-walled) or complex (solid components, thick walls, septations). This distinction drives management.

Blood Work

• CA-125: Often ordered but easily misinterpreted. It is elevated in endometriosis, fibroids, pelvic inflammatory disease, pregnancy, and menstruation — not just cancer. Most useful in postmenopausal women.
• HE4 and ROMA score: Newer markers that improve specificity when combined with CA-125.
• Pregnancy test: Always. An ectopic pregnancy can look like an ovarian cyst.
• CBC: If concern for rupture with bleeding or infection.

MRI

Reserved for cysts that are indeterminate on ultrasound. MRI can better characterize tissue types and guide surgical planning.

Treatment Options

Watchful Waiting

The treatment for most functional cysts is time. Repeat ultrasound in 6-8 weeks. If it is gone, you are done. If it persists, repeat imaging in another cycle.

Oral Contraceptives

OCPs do not shrink existing cysts, despite common belief. However, they prevent new functional cysts from forming by suppressing ovulation. This is useful for women who recurrently develop symptomatic functional cysts.

Surgical Removal

Indicated for:

• Cysts over 7-10 cm that are not resolving
• Complex cysts concerning for malignancy
• Symptomatic cysts not responding to conservative management
• Ovarian torsion (emergency surgery)
• Endometriomas affecting fertility

Cystectomy (removing the cyst, preserving the ovary) is preferred when possible. Oophorectomy (removing the entire ovary) is sometimes necessary but should be avoided in young women when preservation is feasible.

The Emotional Side

Having a "cyst" sounds scary. The word carries weight. But understanding that most ovarian cysts are normal, functional, and self-resolving can save you weeks of anxiety.

The key is appropriate follow-up. A simple cyst that was seen on ultrasound deserves a repeat scan to confirm resolution. It does not deserve an emergency surgery consult.

At Coral, we help women evaluate pelvic symptoms, interpret ultrasound findings, and determine whether a cyst needs monitoring, treatment, or referral. [Start your visit](/start) and we will sort through it together.