Sulphur Burps on Mounjaro: Why They Happen and What You Can Do

Mounjaro works in part by slowing the rate at which food moves through the stomach — a process called gastric emptying. When food lingers in the digestive system longer than usual, it has more time to ferment and produce hydrogen sulphide gas. That gas, when released, is what gives burps their characteristic eggy smell. This mechanism is shared with other GLP-1 medicines, which is why sulphur burps on Wegovy are similarly reported by people taking semaglutide.

The timing often follows a pattern: sulphur burps may appear or worsen in the day or two after an injection, when the medicine is at or near its peak activity. They can also be triggered or made worse by certain foods — particularly those high in sulphur compounds, such as eggs, broccoli, garlic, onions, and red meat.

General burping on Mounjaro is a broader topic worth reading alongside this, as the two experiences often overlap. For a practical look at what may help reduce the frequency of sulphur burps, see how to avoid sulphur burps on Mounjaro.

According to NHS guidance, gastrointestinal effects including belching are among the commonly reported side effects associated with tirzepatide. These are typically described as mild to moderate and most noticeable in the early stages of treatment or after a dose increase.

One of the most useful things you can do when a side effect like this is bothering you is to notice its pattern — when it starts, how long it lasts, and whether anything seems to make it better or worse. That is exactly what GLP Trackr's side-effect tracker is designed for. You can log sulphur burps (and other digestive symptoms) each day, and over time the app surfaces patterns in your data — for example, whether symptoms spike after certain foods or consistently follow your injection day.

That logged record can also be genuinely useful to bring to your next prescriber appointment. Rather than trying to recall how often something happened over several weeks, you have a clear timeline to share. GLP Trackr's doctor report feature pulls your tracked data into a summary you can discuss with your healthcare professional.

If you want to explore whether specific foods are contributing, the food logging feature lets you record meals quickly — including a photo scan that estimates calories and macros from a snap of your plate — so you can look back and spot any connections between what you ate and when symptoms appeared.

If sulphur burps are severe, persistent, or accompanied by other symptoms that worry you, contact your healthcare professional promptly. GLP Trackr helps you record what you are experiencing so you can have a more informed conversation with your prescriber — it is not a substitute for their advice. You can find more information on the full range of commonly reported digestive symptoms in the Mounjaro side effects guide.

Start logging your symptoms today — GLP Trackr is free to try for 7 days, available on the App Store and Google Play.