Egg Burps on Mounjaro: What Causes Them and What You Can Do

Egg burps — sometimes called sulphur burps — have a distinctive rotten-egg smell caused by hydrogen sulphide gas in the digestive tract. On Mounjaro, they are closely linked to the medicine's effect on gastric emptying. Tirzepatide acts on both GLP-1 and GIP receptors, and one well-recognised result is that food moves through the stomach more slowly than usual. When food lingers longer before passing into the small intestine, the digestive process can produce more sulphurous gas — and that gas finds its way out as a burp.

When are they most likely to happen?

Many people find egg burps are most noticeable in the 24–72 hours after an injection, or in the days following a dose increase. They can also be triggered or made worse by certain foods — particularly those high in sulphur compounds, such as eggs, red meat, onions, garlic, broccoli, and cabbage. High-fat meals, which already sit heavily on the stomach, are another common trigger for some people.

The slower-stomach effect tends to be most pronounced early in treatment and after titration steps. For many people, the frequency and intensity of egg burps reduces as their body adapts — though individual experience varies considerably. You can read more about the broader range of burping patterns people notice in our guide to burping on Mounjaro, and about the sulphurous variety specifically in our deeper look at sulphur burps on Mounjaro.

Is this the same as regular burping?

Not quite — regular burping is simply swallowed air escaping, whereas egg burps specifically involve hydrogen sulphide produced during digestion. Both are reported on Mounjaro, but the egg-smell variety tends to be the one people find most socially uncomfortable and therefore most worth tracking. For a broader look at what egg burps on Mounjaro involve, including how common they are, that linked page goes into more detail. You can also explore the full picture of reported digestive and other side effects in the Mounjaro side effects overview.

Understanding your own pattern is genuinely useful here — and that is exactly where GLP Trackr's side-effect tracker comes in. Rather than trying to remember whether the egg burps were worse this week or last, you can log them in the moment: when they started, how intense they felt, and what you had eaten beforehand. Over time, the app surfaces correlations you might not have spotted yourself — for instance, whether they cluster in the days after your injection, or whether certain meals are consistently the trigger.

Many people also find it helpful to use the food logging feature alongside side-effect tracking. You can log meals quickly by snapping a photo with the AI food scanner, or by searching manually — which makes it straightforward to look back and see whether high-sulphur or high-fat foods line up with worse days. That kind of personal data can make a real difference when you sit down to discuss your experience with your prescriber.

If egg burps are disrupting your daily life, feel persistent, or are accompanied by other symptoms that worry you, speak to your healthcare professional promptly — they can review your full picture and advise you appropriately. GLP Trackr helps you record what is happening so you can communicate it clearly; it is not a substitute for that clinical conversation.

Give the side-effect tracker a try — GLP Trackr is available on the App Store and Google Play, with a free 7-day trial so you can see whether logging your symptoms actually helps you spot patterns before spending anything.