What is endometriosis?
Endometriosis is a chronic condition in which tissue similar to the lining of the uterus grows outside the uterus, often on the ovaries, fallopian tubes, and the lining of the pelvis. It affects about 1 in 10 women of reproductive age and can cause severe pelvic pain, painful periods, pain during intercourse, and difficulty getting pregnant.
Two key processes drive endometriosis: the hormone estrogen fuels its growth, and ongoing inflammation in the pelvis worsens it. Current treatments, such as birth control pills, progestins, and other hormonal medications, work mainly by lowering estrogen or suppressing ovulation. These treatments help many people, but they don't work for everyone, and symptoms often return once treatment stops.
What are GLP-1 medications?
GLP-1 receptor agonists ("GLP-1 medications") are drugs first developed for type 2 diabetes and, more recently, obesity. You may know them by brand names like Ozempic, Wegovy, Mounjaro, or Zepbound. They mimic a natural hormone called GLP-1 that helps regulate blood sugar, appetite, and body weight.
In clinical trials, GLP-1 medications helped people lose 15–21% of their body weight. But researchers found these drugs do much more than aid weight loss: they also reduce inflammation and may affect the reproductive system.
Why are GLP-1 medications potentially helpful for endometriosis?
There are several reasons:
- Anti-inflammatory effects: GLP-1 medications have been shown to reduce inflammation by calming down overactive immune cells and lowering levels of inflammatory chemicals in the body. In laboratory studies, they block key inflammation pathways (such as NF-κB) that are also active in endometriosis.
- Effects on the immune system: GLP-1 medications appear to shift immune cells called macrophages toward a less inflammatory state and may increase the activity of regulatory immune cells that help keep inflammation in check. Since immune dysfunction plays a role in endometriosis, this is an area of active interest.
- Anti-fibrotic (anti-scarring) properties: endometriosis can cause scar tissue and adhesions. Early laboratory research suggests GLP-1 medications may have anti-fibrotic effects that reduce scarring, though this has not yet been studied in endometriosis tissue.
- Metabolic and hormonal connections: obesity is associated with higher inflammation and changes in hormonal balance. By improving insulin sensitivity and metabolic health, GLP-1 medications may indirectly benefit conditions tied to inflammation and hormonal imbalance.
- GLP-1 receptors in reproductive tissue: GLP-1 receptors, the "docking stations" these medications attach to, are present in the uterus, ovaries, and other reproductive tissues. This means the medications could act directly on reproductive organs, though their effect in endometriosis is still unknown.
What does the research show so far?
No clinical trials have yet tested GLP-1 medications specifically for endometriosis. The interest rests on scientific reasoning and indirect evidence. For example:
- Laboratory and animal studies have shown that GLP-1 medications reduce inflammation and fibrosis (scarring) in various tissues, including reproductive organs.
- In women with polycystic ovary syndrome (PCOS), GLP-1 medications have improved menstrual regularity, reduced androgen (male hormone) levels, and improved ovulation. Some of these benefits appear to go beyond what weight loss alone would explain.
- In animal models, GLP-1 receptor activation has been linked to anti-inflammatory and anti-fibrotic effects in the uterus.
- Researchers studying endometrial cancer have found that GLP-1 receptor activation can slow cell growth and promote cell death in abnormal endometrial tissue, suggesting these medications may influence how endometrial-type tissue behaves.
Importantly, none of these findings come from endometriosis patients, so the benefits above remain theoretical. No clinical trial has tested whether GLP-1 medications reduce endometriosis pain, shrink lesions, or improve quality of life.
GLP-1 medications are also not approved during pregnancy and should not be used if you are pregnant or planning to become pregnant soon. They can cause side effects such as nausea, vomiting, diarrhea, and constipation, and they slow stomach emptying, which may affect how other medications are absorbed.
What should you do with this information?
If you have endometriosis, continue to follow your treatment plan as discussed with your healthcare provider.
Talk to your doctor if you are curious about GLP-1 medications, especially if you also have obesity, diabetes, or PCOS. Your doctor can help you understand whether these medications might be appropriate for your overall health, but at this time, they would not be prescribed specifically for endometriosis.
Stay informed. This field is moving quickly. As scientists learn more about how GLP-1 medications affect inflammation and reproductive health, trials focused on endometriosis may follow.
Observations from Dr. Meyer
I have treated several patients with endometriosis who have used GLP-1 medications for other indications, not for endometriosis. So far, I have seen mixed results, with some patients reporting improvement in endometriosis symptoms, and others who have not experienced any change. It is important to note that these are anecdotal cases, and no clinical conclusions can be drawn.