Adenomyosis Belly: What It Looks Like and What Can Change

An adenomyosis belly is a swollen, rounded or full lower belly in a person with adenomyosis. It is linked to a larger uterus and to bloating, and it shows up as "bloating or fullness in your belly (adenomyosis belly)".

Adenomyosis is a condition where tissue like the lining of the uterus grows into the muscle wall of the uterus. This guide covers how the belly can look and feel, why it happens, and what treatment can change. It is general information. Your own doctor decides what is right for you.

For the full list of symptoms, see our guide to adenomyosis symptoms. This page is only about the belly.

What an adenomyosis belly looks and feels like

An adenomyosis belly can have two parts. They can happen at the same time.

A larger uterus. Adenomyosis can make the uterus thicker and larger, sometimes up to double or triple its usual size. The uterus sits low in your pelvis, so the change shows below your belly button. You may notice that your lower belly looks rounder than it did before, or that waistbands feel tighter there. This change is in the organ itself, so it does not go down overnight. At a pelvic exam, a doctor may find that the uterus is larger, softer or painful to touch.

Bloating that comes and goes. "Bloating, heaviness or fullness in your tummy" is a symptom of adenomyosis. This symptom can happen at any time in your menstrual cycle. So your belly can look and feel different from one day to the next.

Many people also feel it more than they see it. It feels like "a feeling of fullness or heaviness in your abdomen". For more on that heavy, dragging feeling, see heavy feeling in the pelvis.

Not everyone with adenomyosis gets a swollen belly. Some people have no symptoms at all.

Why it happens

Left: a typical uterus with an even muscle wall. Right: adenomyosis, a larger, rounder uterus with a thicker muscle wall.

In adenomyosis, tissue like the uterine lining grows into the muscle of the uterus. This leads to "a diffuse uterine enlargement", which means the whole uterus gets bigger. A larger uterus takes up more room in the pelvis, so the lower belly can look fuller.

The hormone oestrogen (estrogen) helps this tissue grow. This is why hormone treatments are part of care, and why symptoms often ease after menopause.

Doctors do not know what causes adenomyosis. You may be more likely to get it if you are over 30 and have given birth.

Adenomyosis belly or endo belly?

The names sound alike, and the two conditions often get mixed up. Adenomyosis is in the muscle wall of the uterus. Endometriosis is a different condition, where tissue like the lining of the uterus grows in other places, such as the ovaries or fallopian tubes.

So an adenomyosis belly is linked to the size of the uterus and to bloating. Endo belly is the name people use for bloating with endometriosis. You can have both conditions at once. Our guide to adenomyosis vs endometriosis compares them side by side and explains treatment when you have both.

Adenomyosis belly or belly fat?

Many people search for "adenomyosis belly fat". The sources in this guide describe an adenomyosis belly as a larger uterus plus bloating or fullness. None of them describe it as fat. None of them list weight loss as a treatment for adenomyosis either.

What causes adenomyosis is not known, and the sources do not link it to food or exercise. If your lower belly has changed shape, it is not your fault.

Changes in body shape have many causes, and a doctor can help tell them apart. At an NHS appointment, the doctor may feel your tummy for swelling or bloating. They may also send you for an ultrasound or MRI scan. An MRI can show if the uterus is larger or thicker in places. If you have PCOS as well, our guide to PCOS belly, bloating and weight gain may help.

What can change before and after treatment

Treatment for adenomyosis mostly aims at pain and heavy bleeding. No medicine is approved for adenomyosis itself, and the evidence on which medicine works best is limited. Here is what the sources say about the belly and the size of the uterus.

Hormonal IUD (IUS, Mirena)

The hormonal IUS is the first treatment listed. It thins the lining of the uterus, so periods are lighter and less painful. It can also make the uterus smaller. This change can be slow. In one study, the uterus got smaller more slowly than the researchers expected.

The pill and other hormone treatments

The progestogen-only pill, the combined pill and the patch are options for people who cannot or do not want to have an IUS. In one trial, both the combined pill and the hormonal IUD made the uterus smaller and eased pain and bleeding. The hormonal IUD did better on both.

Medicines called GnRH agonists can also make the uterus smaller. They can cause menopause-like side effects, so they are for short-term use only.

Menopause

Symptoms of adenomyosis often go away after menopause, because oestrogen levels drop. After menopause, you may still have a larger uterus.

Hysterectomy

A hysterectomy is surgery to remove the uterus. It is the only definitive treatment for adenomyosis, which means the only one that cures it. After it, you do not have periods and you cannot get pregnant. Doctors use it for adenomyosis when other treatments have not worked or are not an option. The sources do not describe how the belly looks after surgery. Ask your surgeon what to expect for you.

About "before and after" photos

Photos online show one person's result. In the research, a change in uterus size can be slow, and the studies are small. If you start a treatment, a record of your own symptoms tells you more than someone else's photos.

When to see a doctor

See a GP if:

• Your periods become more painful, heavier or irregular.
• Heavy periods affect your life, or you have had them for some time.
• You have felt bloated for a while (about 3 weeks).
• You have pain during sex.
• You bleed between periods or after sex.

Call your provider for very heavy periods, very painful cramps, or a feeling of fullness or heaviness in your abdomen.

Get urgent help if your pelvic pain or period pain is severe or worse than usual, and painkillers have not helped. In the UK, ask for an urgent GP appointment or use NHS 111. In other countries, contact your local urgent care service.

What to track

A short daily note makes it easier to show your doctor what is happening. Track these items:

• Belly size or tightness. Note how your waistband feels, or measure around your lower belly at the same spot and time of day. Skip the tape measure if it does not feel good for you.
• Bloating days. Write down which days you felt bloated and how long it lasted.
• Pain. Give it a score from 0 to 10, and note where it was. For help with the score, see how to describe period pain.
• Heavy bleeding. Count the pads or tampons you used, and note any flooding or clots.
• Cycle day. This shows if the swelling follows your cycle or stays the same.
• Treatment changes. Write the date you start, stop or change any treatment.

After 2 or 3 cycles, you can see if the swelling comes and goes, or if it stays the same all month. That pattern helps your doctor decide what to check next. Our guide to a pain diary your doctor will read has more tips.

Endolog is a pain and symptom diary for endometriosis and adenomyosis. You log pain, bloating, bleeding and notes on the days they happen, and you get a record to show your doctor. A paper notebook works too, or the free printable food and symptom diary, which records bloating next to meals and cycle day.

Frequently asked questions

Does an adenomyosis belly go away?

Bloating can come and go. A larger uterus changes slowly, if at all. Some hormone treatments can make the uterus smaller over time. After menopause, symptoms often go away, but the uterus may stay larger.

Can exercise or diet flatten an adenomyosis belly?

None of the sources in this guide list diet or exercise as a treatment for a larger uterus. Movement and food can still help you feel well. Talk to your doctor about treatments for the adenomyosis itself.

How do I know if my swollen belly is adenomyosis?

You cannot tell from how it looks alone. A doctor can examine you and may send you for an ultrasound or MRI scan.

This article is for general information. It does not replace advice from your own doctor, who decides what treatment is right for you.