Endometrial Hyperplasia

What is endometrial hyperplasia?

Endometrial hyperplasia is a condition in which the lining of the uterus, called the endometrium, becomes thicker than normal because its cells grow more than they should. The endometrium is the tissue that builds up each month during the menstrual cycle and is shed as a period. In endometrial hyperplasia, the balance between the two main female hormones is disturbed: there is too much estrogen (the hormone that makes the lining grow) compared with progesterone (the hormone that stabilizes the lining and helps it shed). Over time, the lining keeps building up, and the cells can become crowded and irregular.

Endometrial hyperplasia is not cancer. However, some forms can, over time, develop into endometrial cancer (cancer of the uterine lining), which is why doctors take the condition seriously and monitor it carefully. Doctors generally divide endometrial hyperplasia into two groups based on how the cells look under a microscope:

• Hyperplasia without atypia: the cells are more numerous than normal but still look mostly normal. The risk of this type turning into cancer is considered low.
• Atypical hyperplasia (also called endometrial intraepithelial neoplasia, or EIN): the cells look abnormal. This type carries a higher risk of progressing to cancer, and in some cases cancer is already present when the diagnosis is made.

The condition most often affects women who are approaching or have passed menopause, typically in their 40s, 50s, and beyond, because hormone patterns change during this stage of life. It can also occur in younger women who have irregular or absent ovulation, such as those with polycystic ovary syndrome (PCOS), a hormonal condition that affects how the ovaries release eggs. Endometrial hyperplasia is usually managed by a gynecologist, a doctor who specializes in the female reproductive system.

Endometrial hyperplasia symptoms

The most common endometrial hyperplasia symptom is abnormal bleeding from the uterus. Because the lining is thicker and less stable than usual, it may shed unpredictably. Many women notice one or more of the following:

• Menstrual periods that are heavier than usual or last longer than usual
• Bleeding or spotting between periods
• Menstrual cycles that are shorter than 21 days or otherwise irregular
• Any vaginal bleeding after menopause, even a small amount
• Bleeding after sexual intercourse
• Periods that stop for months and then return heavily
• Unusual vaginal discharge, in some cases
• Pelvic pressure or discomfort, although this is less common

Symptoms do not reliably tell the difference between hyperplasia without atypia and atypical hyperplasia; both types can cause similar bleeding patterns. Some women have no symptoms at all, and the condition is found only when a scan or biopsy is done for another reason. In women who have gone through menopause, any bleeding is considered abnormal and should be checked by a doctor, because it can be a sign of endometrial hyperplasia, endometrial cancer, or other treatable conditions. In women who are still having periods, changes in the usual pattern, especially heavy or prolonged bleeding, are the main clue. Heavy bleeding over time can also lead to anemia (a low red blood cell count), which may cause tiredness, weakness, or shortness of breath.

Causes and risk factors

The main endometrial hyperplasia cause is prolonged exposure of the uterine lining to estrogen without enough progesterone to balance it. This is often described as unopposed estrogen. During a normal menstrual cycle, estrogen makes the lining grow in the first half of the cycle, and after an egg is released (ovulation), progesterone is produced to mature and stabilize the lining. If ovulation does not happen regularly, progesterone is not produced in the usual way, and the lining continues to grow under the influence of estrogen.

Situations and conditions that can lead to unopposed estrogen or that are linked to a higher risk include:

• Perimenopause: the years leading up to menopause, when ovulation becomes irregular and hormone levels fluctuate.
• Being overweight or obese: fat tissue converts other hormones into estrogen, raising the body’s overall estrogen level.
• Polycystic ovary syndrome (PCOS): a condition that causes infrequent or absent ovulation.
• Estrogen-only hormone therapy: taking estrogen after menopause without a progestin (a synthetic form of progesterone) in a woman who still has a uterus.
• Tamoxifen: a medication used in breast cancer treatment that can act like estrogen on the uterine lining.
• Never having been pregnant or starting menstruation early and reaching menopause late, which increase lifetime exposure to estrogen.
• Diabetes, high blood pressure, and thyroid disease, which are associated with the condition, partly through their links with weight and hormone balance.
• Certain rare ovarian tumors that produce estrogen.
• Family history: an inherited condition called Lynch syndrome raises the risk of endometrial cancer and may make careful monitoring more important.

Having one or more risk factors does not mean a woman will develop endometrial hyperplasia, and some women develop it without any obvious risk factor. Risk factors simply help doctors decide who may benefit from closer attention.

Endometrial hyperplasia diagnosis

Endometrial hyperplasia diagnosis is based on examining a sample of tissue from the uterine lining under a microscope. Symptoms and scans can raise suspicion, but only a tissue sample can confirm the condition and show whether atypical cells are present. The usual steps are:

• Medical history and pelvic examination: your doctor will ask about your bleeding pattern, menopausal status, medications, and other health conditions, and will perform a physical examination.
• Transvaginal ultrasound: a small ultrasound probe is placed in the vagina to produce images of the uterus. This lets the doctor measure the thickness of the endometrium. In women after menopause, a lining that is thicker than expected may prompt further testing. In women who are still menstruating, the thickness naturally changes through the cycle, so ultrasound alone is less conclusive.
• Endometrial biopsy: a thin, flexible tube is passed through the cervix (the opening of the uterus) to collect a small sample of the lining. This can often be done in a clinic without general anesthesia and may cause cramping for a short time.
• Hysteroscopy: a thin, lighted telescope is inserted through the cervix so the doctor can look directly at the inside of the uterus and take targeted samples from any areas that look abnormal. It may be done in a clinic or in an operating room.
• Dilation and curettage (D&C): a procedure, usually under anesthesia, in which the cervix is gently widened and the lining is scraped or suctioned to collect a larger tissue sample. It may be used when a clinic biopsy is not possible or does not give enough tissue.

A pathologist, a doctor who examines tissue under the microscope, then classifies the sample as hyperplasia without atypia or atypical hyperplasia (EIN), or reports another finding such as normal lining, polyps, or cancer. Blood tests may be ordered to check for anemia or to look at hormone or thyroid levels if the history suggests a hormonal cause. This classification is what guides the choice of endometrial hyperplasia treatment.

Endometrial hyperplasia treatment options

Endometrial hyperplasia treatment depends mainly on the type found on biopsy, your age, whether you wish to have children in the future, and your overall health. The goals are to stop abnormal bleeding, return the lining to normal, and reduce the risk of cancer developing. Your doctor may discuss the following approaches.

Observation and addressing the underlying cause. For hyperplasia without atypia, especially when a clear cause such as estrogen-only hormone therapy is identified and stopped, some women may be monitored with repeat biopsies to see whether the lining returns to normal on its own. Weight management and treatment of conditions such as PCOS or diabetes may be recommended as part of the plan, because they influence hormone balance.

Progestin therapy. Progestins are the most common medical treatment. They counteract estrogen and encourage the thickened lining to thin and shed. Progestin can be given in several ways:

• A levonorgestrel-releasing intrauterine device (IUD), a small device placed inside the uterus that releases progestin directly to the lining. Many guidelines consider this a preferred first option for hyperplasia without atypia, and it may also be used in selected cases of atypical hyperplasia.
• Oral progestin tablets, taken either continuously or for part of each month.
• Progestin injections, in some situations.

During progestin therapy, follow-up biopsies are usually taken at intervals, often every few months at first, to check that the lining is responding. Treatment commonly continues for at least six months, and longer in many cases. Side effects can include irregular bleeding, breast tenderness, mood changes, and bloating, and your doctor can help weigh these against the benefits.

Surgery. A hysterectomy, an operation to remove the uterus, is generally recommended for atypical hyperplasia in women who have completed childbearing, because of the higher chance that cancer is present or will develop. Removal of the ovaries and fallopian tubes may be discussed at the same time, particularly for women who are past menopause. Hysterectomy may also be considered for hyperplasia without atypia if it does not respond to progestin, if it returns after treatment, or if bleeding remains troublesome and the woman does not want further hormonal treatment. Depending on the individual case, the operation can be performed through the vagina, through small abdominal incisions using a camera (laparoscopic or robotic-assisted surgery), or through a larger abdominal incision.

Fertility-preserving management. Younger women with atypical hyperplasia who wish to become pregnant may be offered high-dose progestin therapy with close monitoring instead of immediate surgery. This approach requires regular biopsies and careful follow-up, and doctors often recommend hysterectomy once childbearing is complete because the condition can come back.

Recovery after hysterectomy usually takes several weeks, with the exact time depending on the type of surgery and individual factors. No physical rehabilitation program is generally needed, but gradual return to activity, wound care advice, and follow-up visits are part of standard care. At Acibadem, endometrial hyperplasia is evaluated and treated within the Gynecology & Obstetrics department.

Living with endometrial hyperplasia and outlook

For most women, the outlook with endometrial hyperplasia is favorable, particularly for hyperplasia without atypia, which often resolves with progestin treatment or, in some cases, on its own once the hormonal cause is corrected. Atypical hyperplasia requires more careful management because of its closer link to cancer, but when it is identified and treated, many women do well. No treatment can offer a guarantee, and the condition can return, so follow-up is a key part of living with the diagnosis.

Practical points that many doctors discuss include:

• Attending all scheduled follow-up appointments and biopsies, even when bleeding has stopped, because the lining can only be assessed by sampling it.
• Keeping a simple record of any bleeding, including timing and heaviness, to share with your care team.
• Maintaining a healthy weight and managing diabetes or blood pressure, which may help restore hormone balance and lower the chance of recurrence.
• Reviewing any hormone therapy or other medications with your doctor so that estrogen is always balanced with a progestin if you still have a uterus.
• Discussing plans for pregnancy openly, since they shape treatment choices.

Women who have had a hysterectomy no longer have a uterine lining and therefore cannot develop endometrial hyperplasia again. If the ovaries were also removed before menopause, they may experience menopausal symptoms, and their doctor can discuss ways to manage these. Emotional support from family, friends, or counseling can be helpful, as a diagnosis that mentions cancer risk is naturally worrying even when the actual risk is low.

Frequently asked questions

Is endometrial hyperplasia cancer?

No. Endometrial hyperplasia is a non-cancerous overgrowth of the uterine lining. However, it is considered a condition that can lead to cancer in some cases, particularly the atypical type. This is why doctors classify it carefully after a biopsy and recommend treatment and follow-up rather than simply ignoring it. Hyperplasia without atypia carries a low risk of progressing, while atypical hyperplasia carries a higher risk.

What are the first symptoms of endometrial hyperplasia?

The first and most common endometrial hyperplasia symptom is a change in bleeding. This may be heavier or longer periods, bleeding between periods, or any bleeding after menopause. Some women have no symptoms, and the condition is found during tests for another reason. Because bleeding changes have many possible causes, a doctor’s evaluation is needed to find out what is responsible.

What causes endometrial hyperplasia?

The main endometrial hyperplasia cause is too much estrogen acting on the uterine lining without enough progesterone to balance it. This can happen during perimenopause, with PCOS, with excess body weight, with estrogen-only hormone therapy after menopause, or with certain medications such as tamoxifen. Sometimes no single cause is found.

How is endometrial hyperplasia diagnosed?

Endometrial hyperplasia diagnosis requires a tissue sample from the uterine lining, obtained by an endometrial biopsy, hysteroscopy with biopsy, or dilation and curettage. A transvaginal ultrasound is often done first to measure the thickness of the lining, but it cannot confirm the diagnosis on its own. A pathologist examines the sample and reports whether atypical cells are present.

Can endometrial hyperplasia go away on its own?

In some cases, hyperplasia without atypia may return to normal without treatment, especially if the underlying hormonal cause is removed, such as stopping estrogen-only therapy or after ovulation becomes regular again. Even so, doctors usually recommend follow-up biopsies to confirm this, and many women are offered progestin treatment to speed resolution. Atypical hyperplasia is not expected to resolve reliably on its own and generally needs active treatment.

What is the best treatment for endometrial hyperplasia?

There is no single best endometrial hyperplasia treatment for everyone. For hyperplasia without atypia, progestin therapy, often with a progestin-releasing IUD, is commonly used, with follow-up biopsies to confirm the lining has returned to normal. For atypical hyperplasia, hysterectomy is usually recommended for women who have completed childbearing, while younger women who wish to preserve fertility may be offered progestin therapy with close monitoring. Your doctor will tailor the plan to your biopsy result, age, and goals.

Can I still get pregnant with endometrial hyperplasia?

Pregnancy may be possible after successful treatment, particularly for hyperplasia without atypia. Because the condition is often linked to irregular ovulation, some women may need help from a fertility specialist. Women with atypical hyperplasia who want children are usually treated with progestins and monitored with repeat biopsies, and pregnancy is generally attempted only after the lining has returned to normal. Your doctor can discuss timing and any ongoing risk.

When to see a doctor

Any change in your usual bleeding pattern deserves a medical evaluation, because endometrial hyperplasia and other conditions of the uterine lining are much easier to manage when found early. Make an appointment with a gynecologist if you notice bleeding between periods, periods that have become noticeably heavier or longer, cycles shorter than three weeks, or any bleeding after sexual intercourse. If you have already been diagnosed with endometrial hyperplasia, keep to your follow-up schedule and report new or returning bleeding.

Seek prompt or urgent medical care if you experience any of the following red-flag signs:

• Any vaginal bleeding after menopause, no matter how light
• Bleeding so heavy that you soak through a pad or tampon every hour for several hours in a row
• Passing large clots or bleeding that does not slow down
• Dizziness, fainting, a racing heartbeat, or shortness of breath alongside heavy bleeding, which can be signs of significant blood loss
• Severe pelvic or abdominal pain
• Fever, chills, or foul-smelling discharge, particularly after a biopsy or procedure
• Vaginal bleeding during pregnancy

These symptoms do not necessarily mean cancer, but they need timely assessment so that the cause can be identified and treated appropriately.