Feeling Cold on Mounjaro: Is It a Known Side Effect?

Mounjaro acts on GLP-1 and GIP receptors, which play a role in regulating appetite and the sensation of fullness. Many people eating significantly less than before — a common experience on tirzepatide — take in fewer calories overall. Because the body generates heat partly through the process of metabolising food, a meaningful drop in calorie intake can sometimes leave people feeling cooler than usual, particularly in the hands, feet, or generally.

It is also worth considering a few other factors that sometimes run alongside a cold feeling:

• Fatigue — tiredness is a commonly reported side effect of Mounjaro and can make temperature regulation feel harder. You can read more about other commonly reported Mounjaro side effects that may occur alongside cold sensitivity.
• Reduced food intake — eating less means fewer calories available for thermogenesis (heat production).
• General adjustment period — the body adapting to appetite changes in the early weeks of treatment.

Feeling cold is generally not listed as a direct pharmacological effect of tirzepatide in the product information, but it is a pattern some users notice and worth logging. According to NHS guidance, any persistent or concerning new symptom while taking a prescription medicine should be raised with a healthcare professional.

If the cold feeling is accompanied by other symptoms — such as unexplained weight changes beyond what your prescriber expects, fatigue, or changes in your hair or skin — it is worth mentioning this to your prescriber or doctor, as they may wish to check other potential causes unrelated to Mounjaro. You can also find an overview of the broader side effect picture in our guide to Mounjaro side effects.

One of the most practical things you can do when you notice a side effect like feeling cold is to record it consistently — when it occurs, how strong it is, and whether it links to anything else in your routine. GLP Trackr's side-effect tracker lets you log symptoms like this after each dose, so you can see whether the pattern shifts over time or clusters around certain days in your injection cycle.

Alongside side-effect logging, the app's daily check-in captures energy levels and mood each morning, which means you can spot whether cold spells tend to coincide with low-energy days or specific points in your weekly schedule. That kind of personal data is genuinely useful to bring to a prescriber appointment — rather than relying on memory, you have a clear record of what happened and when.

If you have also noticed changes around digestive side effects such as burping, logging these together can help you and your prescriber see the fuller picture of how your body is responding.

GLP Trackr is free to try for 7 days and available on the App Store and Google Play — start logging your side effects today and have something concrete to discuss at your next appointment.

A note on safety: if your cold feeling is severe, persistent, or accompanied by symptoms that worry you, contact your healthcare professional promptly. GLP Trackr helps you record what you are experiencing so you can have an informed conversation with your prescriber — it is not a substitute for their advice, and any concerns about your health should always be raised with a qualified clinician.