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Someone who's been using Ozempic and then Wegovy for about three years wrote in saying they now have persistent, widespread canker sores (small painful mouth ulcers). They say the sores started or worsened after they began the medications and have become chronic despite visits to multiple doctors and urgent care. They’re asking for help because current medical checks haven’t found a clear cause. Ozempic and Wegovy are brand names for semaglutide. That’s a medication that acts like a natural gut hormone that helps control appetite and blood sugar. People use it for type 2 diabetes (Ozempic) and for weight loss (Wegovy). It’s not an antibiotic or steroid; it sends signals that make you feel fuller and slows how fast your stomach empties. The drug itself is a “peptide” — basically a small protein-like molecule — designed to sit on specific receptors in the body and mimic that hormone’s effects. What this report shows is an individual patient experience, not a controlled scientific study. A handful of other patients have also mentioned mouth problems, but there isn’t strong published evidence proving semaglutide causes chronic canker sores in most users. Single-person reports can hint at a link worth studying, but they can’t prove it. There are many possible causes of recurrent canker sores, including stress, nutrient deficiencies (like B12, iron, folate), autoimmune conditions, oral trauma, or reactions to other medications or oral care products. In short: this is an anecdote that raises a question rather than settles it. Why people should care: if you’re taking semaglutide and have new or worsening mouth ulcers, it’s reasonable to bring it up with your doctor. Chronic mouth pain can affect eating, speaking, and quality of life. Knowing there are reported cases helps patients and clinicians consider whether the drug might be contributing and to investigate other causes. It also points to a need for more systematic tracking — if many users report the same issue, researchers may study it and update safety advice. Important caveats and risks: because this is a personal report, we can’t assume causation. Stopping or changing a prescription should only happen after talking with the prescribing clinician, since halting semaglutide can have effects on blood sugar and weight management. Some treatments for canker sores (topical numbing gels, steroid mouth rinses, addressing nutritional deficiencies) may help regardless of the cause. If sores are very large, persistent, recur frequently, or are accompanied by other symptoms (like fever, difficulty swallowing, or unexplained weight loss), further medical evaluation is needed to rule out other conditions. Finally, regulatory agencies haven’t broadly labeled chronic canker sores as a common side effect of semaglutide based on current public data. Bottom line: A few people on semaglutide report chronic canker sores, but that’s not proof the drug is the cause — talk to your doctor so you can check for other reasons and discuss safe options.
Source: r/Semaglutide