Yes, an ovarian cyst can cause diarrhea. Mild bowel upset is a fairly common and usually harmless companion to cysts.1Cedars-Sinai. Understanding Ovarian Cysts Most cysts never cause any symptoms at all, though, so diarrhea on its own doesn’t prove the cyst is to blame. In a small number of cases, diarrhea is part of a more urgent problem around the ovary, and the symptoms that come with it tell you which situation you’re in.
How a Cyst Can Upset Your Bowels
Your belly works like a closed compartment, so a cyst that grows even a little can press on the organs packed in beside it.2Cedars-Sinai. Understanding Ovarian Cysts Constipation, diarrhea, bloating and stomachaches can all come from that pressure.3Cedars-Sinai. Understanding Ovarian Cysts Large cysts can also press on the bladder or the large intestine.4Obstetricians & Gynecologists, PC. 4 Signs Your Ovarian Cyst Needs Treatment
Pressure-related symptoms tend to feel like a sense of fullness low in the pelvis, often more on one side, rather than sharp pain. Bloating may be mild in the morning and build as the day goes on. Some women feel a frequent urge to go, for stool or urine, yet pass only a little.
A cyst can cause diarrhea as well as constipation because pressure acts on the bowel in two ways. A cyst sitting against the bowel can irritate its wall, and an irritated bowel tends to push contents through faster, which shows up as loose stools. Pressure can also narrow or kink a stretch of bowel so that stool moves slowly, which causes constipation and a backed-up feeling. The same woman may swing from loose stools one week to constipation the next.
Size matters here. Most cysts measure around 2 to 3 centimeters, roughly the size of a grape.5Cedars-Sinai. Understanding Ovarian Cysts In rare cases they grow as large as 30 centimeters.6Cedars-Sinai. Understanding Ovarian Cysts Bowel and bladder effects, along with swelling and pressure, usually appear only once a cyst reaches a substantial size.7Cedars-Sinai. Understanding Ovarian Cysts A small cyst seen on a scan is therefore less likely to explain daily diarrhea.
Is It the Cyst or IBS
When cysts do cause symptoms, those symptoms can closely resemble irritable bowel syndrome (IBS).8Circle Health Group. Is it IBS or something else If you were told you have IBS but your symptoms changed recently, a cyst is worth ruling out.
Some patterns lean one way or the other. IBS pain typically tracks with eating, stress, or bowel habit, and often eases for a while after a bowel movement. Pain from cyst pressure tends to sit low in the pelvis, often on one side, and does not reliably ease after using the toilet. Pain during sex or changes in urination point more toward a pelvic cause than a gut-only one. IBS usually starts in younger adulthood and lasts for years with a familiar pattern, so a clear new change in that pattern deserves a fresh look. These are leanings, not tests: IBS and cysts can coexist, and only an exam or scan settles which one is involved.
Frequency and newness are clues too. Women with cancerous ovarian masses tend to have symptoms 20 to 30 days a month, more severe and of more recent onset than women with harmless cysts.9JAMA. Frequency of symptoms of ovarian cancer in women presenting to primary care clinics So bloating or bowel changes that are new and happen nearly every day for a few weeks deserve a doctor’s visit. Occasional symptoms are typical of benign cysts.10JAMA. Frequency of symptoms of ovarian cancer in women presenting to primary care clinics
A pelvic exam lets a clinician feel whether an ovary is enlarged or tender, though it can miss small cysts. A pelvic ultrasound is the standard way to see a cyst and measure its size, which tells you whether pressure is a plausible explanation. A two-week diary of stool changes, pain, bloating and cycle days gives the doctor a pattern to work with instead of a vague memory. If you already had a scan showing a cyst, bring the report, since its size and appearance guide what happens next.
Endometriosis Cysts and Period-Linked Diarrhea
An endometrioma is a cyst formed by endometriosis, in which tissue like the uterine lining grows on the ovary. In one reported case, a young woman with two endometriomas had diarrhea and constipation during her periods, along with painful periods and deep pain during sex.11PubMed. Continuous Amenorrhea May Be Insufficient to Stop the Progression of Colorectal Endometriosis Diarrhea that flares each month alongside painful periods is a pattern worth describing to a gynecologist. A uterus that tilts backward can also press on the rectum and cause bowel symptoms that worsen before periods.12PubMed Central. The Retroverted Uterus and Pelvic Floor Dysfunction: 400 BC to 2025 AD
Periods can loosen stools even without a cyst. Around menstruation the body releases chemicals that make the uterus contract, and they can make the bowel contract too. That is why many women get looser stools or cramping on the first days of a period. Mild, predictable period diarrhea is not by itself a sign of endometriosis, but severe pain, or bowel symptoms that get worse cycle after cycle, are not part of a normal period and deserve evaluation.
Before the appointment, mark which days of the cycle bring diarrhea, constipation or bloating, since timing is what links symptoms to a period. Note pain during sex and pain with bowel movements, because gynecologists ask about both when considering endometriosis.
When Diarrhea Signals an Emergency
A tubo-ovarian abscess is a pocket of pus around the ovary and fallopian tube, usually from a pelvic infection. Diarrhea was three times as common in women with such an abscess as in women with pelvic infection alone, 62% versus 19%.13Elsevier / International Journal of Gynecology & Obstetrics. Comparative study of the clinical features of patients with a tubo-ovarian abscess and patients with severe pelvic inflammatory disease Fever, a high white blood cell count and diarrhea together pointed toward an abscess.14Elsevier / International Journal of Gynecology & Obstetrics. Comparative study of the clinical features of patients with a tubo-ovarian abscess and patients with severe pelvic inflammatory disease In one reported case, a pelvic abscess and bloody diarrhea first looked like ovarian cancer on imaging.15PubMed Central. Pelvic Salmonella infection masquerading as gynecologic malignancy Pelvic pain with fever and diarrhea needs same-day medical care.
A cyst can also twist or burst, causing bowel changes such as cramping or diarrhea.16Nationwide Children’s Hospital. Ovarian Cyst
Several signs mean going to emergency care now. Sudden severe pelvic pain, especially on one side, can mean a cyst has twisted or ruptured. Fever or chills alongside pelvic pain and diarrhea suggest infection. Vomiting or feeling faint suggests the problem is more than an upset bowel. And pain that keeps getting worse over hours, instead of settling, is reason enough to go.
At the emergency room, blood tests check for signs of infection, such as a raised white blood cell count. An ultrasound looks at the ovary and the cyst, and can show whether the ovary has twisted or a pelvic abscess is present. An abscess is usually treated with antibiotics, and sometimes drained or operated on. A twisted ovary is a surgical emergency, since the aim is to restore blood flow quickly.
Diarrhea From Fertility Treatment, Surgery, or Pain Pills
Ovarian hyperstimulation syndrome (OHSS) is a reaction to fertility drugs that swell the ovaries. Mild to moderate OHSS can cause diarrhea, bloating, nausea, vomiting and tender ovaries.17Mayo Clinic. Ovarian hyperstimulation syndrome – Symptoms and causes Diarrhea and a growing waistline after egg stimulation should be reported to your fertility clinic. Don’t stop a prescribed fertility drug on your own; contact the clinic first.
Anti-inflammatory painkillers such as ibuprofen roughly triple the chance of a bout of sudden diarrhea in the days after taking them.18PubMed Central. Non-steroidal anti-inflammatory drugs as a risk factor for acute diarrhoea: a case crossover study If you’re taking ibuprofen for cyst pain, the pills may explain new diarrhea. Diarrhea from a drug usually begins within days of starting it and typically comes without fever, which can be one clue, though not proof, that the pills rather than the cyst are behind it. If ibuprofen seems to be the trigger, ask a doctor whether acetaminophen is a suitable alternative.
Surgery brings its own bowel changes. Mild changes in the first days are common, since anesthesia and pain medicines slow the gut and the bowel then readjusts. Constipation is more typical than diarrhea early on, and either usually settles as you move around and eat normally. But in one reported case, a teen developed diarrhea and worsening pain days after cyst surgery and was found to have an infection.19PubMed Central. Concurrent acute cystitis, pancolitis, and tubo-ovarian abscess following laparoscopic ovarian cystectomy: a case report Fever, pain that grows instead of fading, or redness at an incision are not part of normal healing. If symptoms are getting worse, call the surgeon’s office within a day instead of waiting it out.
PCOS and Pregnancy Are Different Stories
Polycystic ovary syndrome (PCOS) involves many small follicles on the ovaries rather than one large cyst. It is tied to imbalanced gut bacteria and chronic low-grade inflammation.20PubMed Central. Gut microbiota dysbiosis in polycystic ovary syndrome: Mechanisms of progression and clinical applications The follicles are usually too small to press on the bowel the way a large cyst can, so bowel symptoms in PCOS are unlikely to come from pressure. Because PCOS is often managed through diet, weight, and hormones, bowel symptoms are worth mentioning to the doctor treating it.
Pregnancy works differently again. Bowel changes in pregnancy come mainly from hormones, especially progesterone, more than from physical pressure.21Annals of Internal Medicine. Gastrointestinal motility disorders during pregnancy Progesterone relaxes the gut muscle, which slows digestion, so pregnancy usually causes bloating and constipation rather than diarrhea.22Annals of Internal Medicine. Gastrointestinal motility disorders during pregnancy New diarrhea shouldn’t automatically be written off as pregnancy. With pelvic pain in pregnancy it needs checking, since a known cyst can still twist or cause trouble.
For mild bowel symptoms in the meantime, drink enough fluids to replace what loose stools lose, eat steady fiber, and limit foods that seem to set things off. See a doctor if diarrhea lasts more than a few days or keeps returning.