Types of Bleeding Reported by People on Mounjaro
Menstrual changes
Changes to periods are among the most commonly discussed bleeding-related topics for people taking Mounjaro (tirzepatide). Some people report heavier, lighter, or irregular periods, particularly in the early months of treatment. It is not fully established whether tirzepatide directly causes these changes, or whether they are related to weight loss itself — significant weight changes can alter hormone levels and, in turn, affect the menstrual cycle. If you have noticed changes to your cycle since starting Mounjaro, bleeding between periods on Mounjaro covers this in more detail.
Post-menopausal bleeding
Any bleeding after the menopause should always be reported to a healthcare professional promptly — this is true regardless of whether you are taking Mounjaro or not. Post-menopausal bleeding has a range of causes, some of which need to be investigated. Do not assume Mounjaro is the explanation; contact your prescriber or doctor without delay.
Rectal bleeding
Some people search for information about rectal bleeding (sometimes described as bleeding from the bottom) in connection with Mounjaro. Gastrointestinal effects are among the most commonly reported side effects of tirzepatide — including constipation and diarrhoea — and straining associated with constipation can occasionally cause minor rectal bleeding such as from haemorrhoids or a small tear. However, rectal bleeding should never be self-diagnosed or dismissed. Always discuss it with your prescriber or doctor, who can assess whether it needs investigation.
Conditions that may be affected by GLP-1 treatment
People managing conditions such as endometriosis sometimes ask whether Mounjaro could affect their symptoms. If you are in this situation, Mounjaro and endometriosis explores what is currently known. Any concerns about how your treatment may be interacting with an existing condition should be raised directly with your healthcare team.
If any bleeding is heavy, persistent, or accompanied by pain, dizziness, or other symptoms that concern you, contact your healthcare professional promptly — do not wait for a routine appointment.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Bleeding and Symptoms with GLP Trackr
When something unexpected happens during your treatment, having a clear record of when it started, how it changed, and what else was going on at the same time is genuinely useful — both for spotting patterns yourself and for conversations with your prescriber.
GLP Trackr's side-effect tracking lets you log symptoms as they happen, so nothing gets forgotten between appointments. You can record what you noticed, when, and how severe it felt, and then review how your symptoms changed over time. If you use the daily check-in feature, you build a day-by-day picture of your overall wellbeing — energy, mood, and how you are feeling physically — which adds useful context to any individual symptom you want to discuss.
The doctor report feature can help you bring a clear, organised summary to your prescriber or doctor, so your appointment time is spent on the things that matter rather than trying to reconstruct a timeline from memory.
GLP Trackr is a tracking tool, not a medical service — it records what you log and helps you see patterns, but it is not a substitute for clinical advice. Any decision about your treatment, or any concern about bleeding, belongs with your healthcare professional.
You can also explore the broader Mounjaro information hub for guidance on other aspects of your treatment journey.
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Frequently asked questions.
Some people taking Mounjaro report changes to their periods, including irregular or heavier bleeding. This may be related to weight loss altering hormone levels rather than the medicine directly. If your cycle changes significantly, speak with your prescriber or doctor.
Any post-menopausal bleeding should be reported to a healthcare professional promptly, regardless of whether you are taking Mounjaro. It should not be assumed to be a medication side effect without proper investigation. Contact your prescriber or doctor without delay.
Rectal bleeding should always be discussed with your prescriber or doctor — do not self-diagnose. While GI side effects like constipation can occasionally cause minor rectal bleeding, a healthcare professional needs to assess the cause. Do not delay seeking advice if it is heavy or persistent.
GLP Trackr's side-effect tracker lets you log symptoms, dates, and severity so you can review patterns and share a clear record with your prescriber. It is a tracking tool only and does not replace clinical advice.
Yes — unexpected side effects from prescription medicines can be reported to your national reporting scheme (such as the UK's Yellow Card scheme). You should also inform your prescriber or doctor so they can assess whether any action is needed.