Adenomyosis Diet: What Helps, What to Avoid and Why Iron Matters

There is no proven diet for adenomyosis. Almost no research has tested food in people with adenomyosis, and Australia’s 2025 endometriosis and adenomyosis guideline found no evidence for any non-medical treatment. What diet can do is more practical: protect your iron levels if your periods are heavy, help with bloating and gut symptoms, and support your overall health with a varied, plant-rich eating pattern. This guide explains what adenomyosis is, how it differs from endometriosis, what we borrow from related research (and how strong it is), and which treatments to talk about with your doctor.

What is adenomyosis?

Adenomyosis is a condition where cells like those that line the uterus grow into the muscle wall of the uterus. RANZCOG describes it as an oestrogen-responsive condition that can occur with or without endometriosis.

Healthdirect says about 1 in 5 people with a uterus have adenomyosis, most often between 30 and 50. Jean Hailes notes it can also affect younger women, including teens. Estimates vary widely, from 8.8% to 61.5%, because it is hard to diagnose and many people have no symptoms. About 1 in 3 people with adenomyosis have no symptoms at all.

When there are symptoms, they can include:

• heavy or long periods, sometimes with clots
• painful periods and ongoing pelvic pain
• pain during sex
• tiredness, low energy or dizziness from iron deficiency
• bloating or a feeling of fullness in the belly, sometimes called “adenomyosis belly”, because the uterus can become enlarged

Adenomyosis cannot be diagnosed from a blood test. The Australian guideline recommends ultrasound first, with MRI as a second option.

Adenomyosis vs endometriosis

The two conditions are different, but they often occur together. In studies of people with endometriosis, between 25% and 70% also had adenomyosis.

If you have both, the eating advice is largely the same. Our endometriosis support page explains how we help with endometriosis.

What the research does and does not show

This is the honest part most diet articles skip. A 2026 Australian review of lifestyle treatments for pelvic pain found 21 studies. Only one included people with adenomyosis, and it tested a virtual reality program, not food. The Australian Living Evidence Guideline (RANZCOG, 2025) states there was no evidence for any non-medical treatment for adenomyosis, and makes no specific recommendation about diet.

So everything below is borrowed from two related areas: endometriosis research, and what is known about heavy menstrual bleeding. The table shows how strong each piece is.

Iron: the most concrete nutrition issue

Heavy periods are the most common symptom of adenomyosis. Australia’s Heavy Menstrual Bleeding Clinical Care Standard says women with heavy periods are a high-risk group for iron deficiency, which can progress to iron deficiency anaemia if it is not treated. It recommends that the first assessment rules out iron deficiency and anaemia, using a ferritin test and a full blood count.

Women aged 19 to 50 need 18 mg of iron a day. The national guidelines note that needs vary a lot depending on how much blood is lost each month, so heavy periods can push your needs higher.

Food can help keep iron up:

• Haem iron from red meat, poultry and fish is absorbed more easily than iron from plant foods.
• Plant sources such as legumes, tofu, wholegrains and leafy greens provide non-haem iron. Eating them with vitamin C foods, or with some meat, fish or chicken, helps you absorb more.
• Tea and coffee reduce how much iron you absorb if you have them with meals. Having them between meals helps.
• Vegetarians need about 80% more iron than people who eat meat, because plant iron is absorbed less well.

If you are already low in iron, food alone may not be enough to catch up. Healthdirect advises taking iron supplements only under medical supervision, so ask your GP to check your levels first. Treating the heavy bleeding itself also helps protect your iron. Read more in why women need more iron.

Bloating and gut symptoms

Bloating is common with adenomyosis, partly because the uterus can become enlarged. If you also have endometriosis, bowel symptoms such as pain with bowel motions are common too.

In an Australian survey of 484 women with endometriosis, 44% used diet to manage symptoms. Cutting gluten, cutting dairy and the low FODMAP diet were the most common, and no diet was rated better than another for pain. The best trial so far is small: in a 2025 Australian study of 35 women with endometriosis, 60% had better gut symptoms on a low FODMAP diet, compared with 26% on a control diet. Bloating, abdominal pain and quality of life also improved. The researchers say it still needs testing in everyday life.

The low FODMAP diet is quite restrictive, so it is best done with a dietitian. That way you only cut back on foods that actually trigger your symptoms. Our article on endo belly covers bloating in more detail.

Anti-inflammatory eating and omega-3

Endometriosis and adenomyosis are inflammatory conditions, which is why “anti-inflammatory” diets are so often suggested. The evidence is thin. Two small endometriosis studies asked women to follow a Mediterranean-style diet for five or six months, and pain scores improved. But neither had a comparison group, so we cannot tell how much was due to the diet.

For fish oil, the Australian guideline suggests doctors discuss it for endometriosis pain, while noting there is limited evidence of benefit. In the trial it relied on, fish oil and vitamin D made little or no difference to pain over six months. A Cochrane review of supplements for period pain found no high-quality evidence for any of them, including fish oil.

A Mediterranean-style pattern is still a sensible base. It includes iron-rich foods such as legumes, fish and lean meat, and it does not cut out any food groups. Just treat it as support, not a treatment for adenomyosis. For ideas, see our endometriosis nutrition strategies and this anti-inflammatory dinner.

What to be wary of

• Strict elimination diets. One often-quoted gluten-free study recruited 330 women but only followed the 207 who felt better in the first two weeks, with no comparison group. That makes the results hard to trust.
• Very restrictive diets. The Australian guideline did not recommend a ketogenic diet for endometriosis, despite a small positive trial, because it is restrictive and hard to follow.
• Cutting out food groups. Dropping meat, legumes or wholegrains can make it harder to meet your iron needs, which matters most when periods are heavy.
• Claims that foods “balance hormones” or “lower oestrogen”. These have not been tested in people with adenomyosis.
• Your relationship with food. Living with pain can make food feel like the one thing you can control. If you are cutting out more and more foods, or eating feels stressful, our eating disorder dietitian page explains how we can help.

Treatments to discuss with your doctor

Medical treatment has more evidence than diet, although adenomyosis research in general is limited. Options your GP or gynaecologist may discuss include:

• Pain relief. Anti-inflammatory medicines (NSAIDs), with or without paracetamol.
• Medicines for heavy bleeding. Tranexamic acid and NSAIDs can be offered to ease heavy bleeding, including while you wait for other treatment.
• Hormonal treatments. The Australian guideline suggests offering dienogest, the combined pill, a levonorgestrel hormonal IUD or an etonogestrel implant first. These should be reviewed after about three months.
• Other options. If first-line treatment does not help, GnRH agonists (a second-line option in the guideline), uterine artery embolisation or surgery may be considered.
• Hysterectomy. This stops periods, but the guideline notes there is no evidence for or against it for pain, and it suggests trying hormonal treatment first.

When to see your GP

See your GP if your periods are heavy or painful, if symptoms stop you doing your usual activities, if you have unusual bleeding or pain during sex, or if you feel tired, dizzy or short of breath, which can be signs of low iron. Ask for an iron check if your periods are heavy, even if you feel fine.