Adenomyosis vs. Endometriosis: Differences and Having Both

Understanding the connection between two similar conditions

For many people with chronic pelvic pain, getting a diagnosis is a long and confusing process. You may have heard the terms endometriosis and adenomyosis mentioned together. While they are often called "sister diseases," they are distinct medical conditions that require different treatment plans.

Understanding the differences between adenomyosis vs. endometriosis is the first step in advocating for your health. Whether you have debilitating cramps, heavy bleeding, or a general sense that something is wrong, knowing where the tissue is growing helps you find the right relief.

The difference is in the location

Both conditions involve tissue similar to the lining of the uterus (the endometrium). The main difference is where this tissue actually lives.

What is endometriosis?

In endometriosis, tissue similar to the uterine lining grows outside of the uterus. It is often found on the ovaries, fallopian tubes, the outer uterine surface, or the ligaments supporting the pelvic organs. It can also appear on the bladder or bowel. Each month, this tissue reacts to hormones by thickening and breaking down. Since it is outside the uterus, it cannot leave the body. This causes inflammation, scarring, and pain.

What is adenomyosis?

Adenomyosis happens when this tissue grows into the muscular wall of the uterus, known as the myometrium. Instead of moving to other parts of the pelvis, the cells embed themselves deep within the muscle. This makes the uterine walls thick and heavy, which is why some patients say their uterus feels "boggy."

Why they are called "sister diseases"

Doctors frequently find adenomyosis and endometriosis in the same patient. Some studies show that about 42% of people with endometriosis also have adenomyosis. Because they happen together so often, doctors usually check for both when a patient has heavy and painful periods.

They are separate conditions, but they share a common cause: they are inflammatory diseases driven by estrogen. They tend to flare up at the same time in the menstrual cycle and respond to similar hormone therapies, though surgical options are different because the tissue is in different places.

Symptoms unique to Adenomyosis

Since the tissue in adenomyosis is trapped inside the uterine muscle, it creates physical changes that are less common in endometriosis alone. If you are trying to tell your symptoms apart, look for these specific indicators.

The enlarged or "boggy" uterus

A hallmark sign of adenomyosis is an enlarged uterus. During a physical exam, a doctor might find that the uterus feels soft or is two to three times its normal size. This causes lower abdominal pressure and a visible swelling often called adenomyosis belly.

Heavy menstrual bleeding

Endometriosis is famous for pain, but adenomyosis is known for very heavy periods or "flooding." Because the uterine muscle is full of misplaced tissue, it cannot contract properly to stop the bleeding. This leads to large blood clots, anemia, and exhaustion.

Chronic pressure and radiating pain

Pain from adenomyosis is usually a dull, heavy ache. This is different from the sharp, stabbing pains often linked to endometriosis. The pressure can feel like a constant sense of fullness in the pelvis that spreads to the lower back or down the thighs.

Overlapping symptoms

It is common to have symptoms of both conditions at once. This overlap makes using a comprehensive endometriosis tracker app helpful. If you log your symptoms daily, you can find patterns that help your doctor tell the two apart.

Shared symptoms include:

• Severe Dysmenorrhea: Menstrual cramps that stop you from doing daily activities.
• Dyspareunia: Pain during or after sex.
• Chronic Pelvic Pain: Aches that last for six months or more.
• Gastrointestinal Issues: Bloating, constipation, or painful bowel movements during your period.

The challenge of diagnosis

In the past, doctors could only confirm adenomyosis after a hysterectomy by looking at the uterus under a microscope. Imaging has improved since then. Now, specialized ultrasounds and MRIs can show a thickening in the uterus that points to adenomyosis.

Endometriosis is still hard to see on scans and often requires laparoscopy, a small surgery, to confirm. If your doctor suspects both, they will likely use your history, physical exams, and imaging to make a plan.

Treatment and management

Treatment for both usually starts with simple steps. This includes anti-inflammatory meds (NSAIDs) for pain and hormone treatments like birth control or an IUD to thin the lining and slow the bleeding.

For people with severe adenomyosis who are done having children, a hysterectomy fixes the problem because it removes the affected muscle. However, a hysterectomy does not cure endometriosis, because that tissue lives outside the uterus and can keep causing pain even after the uterus is gone.

Treatment when you have both

If you have both conditions, one treatment may not cover everything.

Hormone treatments can help with both. For adenomyosis, the hormonal coil (IUS) thins the womb lining and makes periods lighter and less painful. For endometriosis, hormones can slow the growth of lesions, but they do not remove lesions that are already there.

Surgery works differently for each one. In endometriosis surgery, lesions are removed by cutting or with a laser. Adenomyosis is inside the muscle wall of the womb, so surgery for it is a hysterectomy or removal of the womb lining. If you have a hysterectomy for adenomyosis, all visible endometriosis should be removed in the same operation.

When you track your symptoms, note each type of pain on its own: sharp or stabbing pain, a dull heavy ache or pressure, and the days you bleed heavily. Your doctor can use this record to decide on scans and treatment.

Related guides and resources

If you are trying to understand your pelvic health, these resources can help:

• Understanding Adenomyosis Belly and Bloating
• Managing Heavy and Painful Periods
• How an Endometriosis Tracker Can Help Your Diagnosis

Take control of your health

Sorting out the differences between adenomyosis and endometriosis is difficult, but you have options. The best tool for your next doctor's visit is a clear record of your symptoms.

By tracking your pain levels and bleeding, you give your medical team the information they need to help you. Endolog is built to make this easy, creating reports that show exactly what you are going through. Start tracking today to get closer to the relief you need.