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Mounjaro and endometriosis: What’s the link?
GLP-1s injections, like Mounjaro, show potential in helping manage symptoms of endometriosis and improve fertility.
While they’re not a cure for endometriosis, research does show promising results; here’s how GLP-1s may help.
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Alexandra Cristina Cowell, Writer & Clinical Content Reviewer
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Medically reviewed by
Dr Alexandra Cristina Cowell
Writer & Clinical Content Reviewer
on Dec 23, 2025.
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Last updated on Dec 23, 2025.
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- Mounjaro isn’t a cure for endometriosis, but it may help manage symptoms by supporting weight loss and improving blood sugar control.
- Obesity, overweight and diabetes can worsen endometriosis, as they can increase inflammation and hormone imbalances that lead to heavier, more painful periods.
- GLP-1s like Mounjaro can improve insulin sensitivity, which can lower inflammation and reduce symptom severity.
- Mounjaro can affect the contraceptive pill, making it less effective, so alternative contraception is recommended when starting or increasing doses.
The short answer
Mounjaro isn’t a treatment for endometriosis; rather, it’s a weight loss and diabetes treatment. But this may explain why it can help manage endometriosis symptoms.
Obesity and diabetes are linked to endometriosis. Obesity can trigger inflammation, which makes your periods more painful and heavy. Type 2 diabetes and insulin resistance can further increase inflammation, worsening endometriosis pain.
By losing weight and treating type 2 diabetes, Mounjaro can alleviate endometriosis symptoms and improve your quality of life.
The science
Mounjaro works in multiple ways to help treat endometriosis, helping either directly or indirectly to regulate inflammatory response mechanisms, hormone synthesis, and insulin management.
Lowering inflammation
Endometriosis is an inflammatory condition in which the endometrial tissues grow outside the uterus, causing pelvic pain, especially when you get your period. Typically, during menstruation, the uterine lining sheds and exits the body. In endometriosis, similar tissue grows outside the uterus, where it has no means of leaving. This trapped tissue causes inflammation, resulting in intense pain.
GLP-1s have several properties that help to reduce inflammation:
- Anti-inflammatory – GLP-1 can help reduce inflammation in the endometrium, which is the innermost lining of the uterus.
- Anti‐fibrotic – In endometriosis, fibrosis refers to the formation of scar tissue, which is a significant contributor to chronic pain. GLP-1 helps prevent the development of fibrosis.
- Anti-oxidative – Oxidative stress directly contributes to inflammation by damaging cells and promoting inflammatory molecules. This leads to more oxidative stress, creating a continuous cycle of inflammation. GLP-1s can reduce oxidative stress, helping break this cycle.
Reducing oestrogen
Oestrogen is a female reproductive hormone that stimulates the growth of the endometrial lining in preparation for pregnancy. If no egg is implanted, oestrogen levels fall, causing the endometrial lining to shed during menstruation.
Endometriosis is a condition where the endometrial tissue grows outside the uterus. This tissue is oestrogen sensitive, meaning that higher levels of oestrogen can cause more tissue growth and worsen symptoms such as pain and inflammation.
People with obesity tend to have higher oestrogen levels because they have more excess fat cells that produce oestrogen. Higher levels of oestrogen can contribute to heavier, more painful periods, and when combined with obesity related inflammation, this can exacerbate endometriosis pain.
Mounjaro helps you lose weight, naturally decreasing fat levels, which in turn lowers the amount of oestrogen produced. This reduction can help reduce inflammation associated with endometriosis.
Improving insulin sensitivity
Insulin resistance (IR) occurs when your body becomes less sensitive to insulin. This can lead to high blood sugar levels, weight gain, and type 2 diabetes.
IR can worsen endometriosis by increasing inflammation and the risk for type 2 diabetes, which further worsens inflammation and endometrial pain.
Tirzepatide, the active ingredient in Mounjaro, can improve insulin sensitivity indirectly by increasing insulin secretion, slowing stomach emptying, and promoting weight loss. This helps reduce inflammation associated with IR.
Mounjaro and the pill
There are some things you need to be aware of if you’re starting Mounjaro while taking oral hormonal contraceptives.
Hormonal contraceptives are often used to help manage the symptoms of endometriosis. Mounjaro slows down stomach emptying, which is beneficial in keeping you full, but it also means it takes longer for medicines to break down and be absorbed. This can make oral contraceptives less effective, which may allow endometriosis symptoms to flare.
Additionally, if you get side effects like vomiting and diarrhoea, this further compromises the effectiveness of the pill. These side effects should subside as your body adjusts to the medicine. But in any case, you should inform your doctor if you’re taking oral contraception so they can monitor your condition throughout the treatment.
It’s also recommended to use a barrier contraceptive method (like condoms) or, where suitable, switch to a non-oral contraceptive (like the coil or implant) for 4 weeks after your first dose and each subsequent dose increase to help protect against pregnancy.
Is Mounjaro right for you?
Mounjaro is licensed for people with a BMI over 30, or 27 with weight-related health conditions like type 2 diabetes, who haven’t been able to lose weight with lifestyle adjustments alone.
If you’re thinking about starting weight loss treatment, and have endometriosis or are taking treatment to manage the condition, it’s important to let your prescriber know, so that they can make adjustments if needed. In some cases, a clinician may advise monitoring your condition more closely to ensure that your treatment is still working effectively.
Can Mounjaro worsen endometriosis?
Overall, Mounjaro should have a beneficial effect on the symptoms of endometriosis.
It’s unlikely that Mounjaro worsens the symptoms of endometriosis, but it can lead to increased bowel movements, as diarrhoea and abdominal discomfort are common side effects of Mounjaro.
Additionally, while Mounjaro won’t directly increase endometriosis pain, it may reduce the effectiveness of oral contraceptives, potentially resulting in more pain.
Your clinician will discuss these things with you before prescribing Mounjaro. If you ever feel uncertain or wish to stop the treatment, you should contact them for further advice.
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Anti-inflammatory role of glucagon-like peptide 1 receptor agonists and its clinical implications. Therapeutic Advances in Endocrinology and Metabolism, 15, 20420188231222367
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S Pathare, A. D., et al. (2024).
The hidden impact of GLP‐1 receptor agonists on endometrial receptivity and implantation. Acta Obstetricia et Gynecologica Scandinavica, 104(2), 258
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Reuter, S., et al. (2010).
Oxidative stress, inflammation, and cancer: How are they linked? Free Radical Biology & Medicine, 49(11), 1603
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The Regulation of Adipose Tissue Health by Estrogens. Frontiers in Endocrinology, 13, 889923
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Does BMI Have an Impact on Endometriosis Symptoms and Endometriosis Types According to the #ENZIAN Classification? Journal of Clinical Medicine, 14(12)
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Causal effects of glycemic traits and endometriosis: A bidirectional and multivariate mendelian randomization study. Diabetology & Metabolic Syndrome, 16, 77
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Greater improvement in insulin sensitivity per unit weight loss associated with tirzepatide versus semaglutide: An exploratory analysis. Diabetes, Obesity and Metabolism, 27(3), pp.1507–1514
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FSRH statement: Glucagon-like peptide-1 (GLP-1) agonists and oral contraception (Feb 2025)
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