Why Wegovy sometimes causes heartburn (and how to manage it)

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Experiencing heartburn on Wegovy? Learn why it happens, how to manage symptoms and when to seek medical advice.

Heartburn is one of the less commonly discussed side effects of Wegovy. However, for some people it can become an uncomfortable part of starting treatment.

The good news is that it is usually temporary, often improving as your body adjusts to the medication. In many cases, simple lifestyle changes are enough to reduce unpleasant symptoms significantly.

But why does Wegovy cause heartburn in the first place?

Here, we explain the causes, what you can do about it and when it might be a good idea to speak to a healthcare professional.

Why can Wegovy cause heartburn?

Wegovy works by mimicking the hormone GLP-1, helping to reduce appetite, increase feelings of fullness and slow the rate at which food leaves the stomach.

This slower gastric emptying is partly why the medication can be so effective for weight loss. However, it can also increase the likelihood of digestive side effects.

When food remains in the stomach for longer, stomach acid has more opportunity to move back up into the oesophagus (the food pipe). This leads to symptoms of acid reflux or heartburn.

Not everyone taking Wegovy experiences this, but it is a recognised consequence of the way GLP-1 medications work.¹

Starting on a low dose and increasing gradually helps reduce digestive side effects, which is one reason Wegovy follows a structured dosing schedule.

What does heartburn feel like?

In case you're lucky enough to have never experienced heartburn before, here are the symptoms to look out for:

A burning sensation behind the breastbone
A sour or acidic taste in the mouth
Regurgitation after eating
Discomfort when lying down
Bloating or burping

Some people notice symptoms only after large meals, while others experience occasional discomfort throughout the day.

Heartburn can be more common among those who already suffer from acid reflux or a hiatus hernia. It can also affect those who tend to eat right before bed, or who regularly consume fatty or spicy foods, alcohol or caffeinated drinks.

Picture of an overweight man holding a drink.

Simple changes like these often make a noticeable difference:

Eat smaller meals
Eat more slowly
Avoid going to bed or lying down immediately after eating
Limit fatty or spicy foods if they trigger symptoms
Stay well hydrated throughout the day
Avoid eating late in the evening

Many people also find that symptoms improve naturally after the first few weeks of treatment with Wegovy.

Can you take heartburn medication on Wegovy?

Over-the-counter antacids or acid-suppressing medicines may help. However, you should always check with your clinician or pharmacist before starting any new medications.

If heartburn becomes persistent or severe, your prescriber may want to review your symptoms.

When should you seek medical advice?

Occasional heartburn is usually not a cause for concern.

However, you should seek medical advice if you experience:

A severe or persistent burning sensation in the chest
Difficulty swallowing
Vomiting blood or material resembling coffee grounds
Black stools
Severe abdominal pain
Symptoms that continue no matter what you do

Symptoms like these could indicate other issues and should not be assumed to be medication side effects.

Does heartburn mean Wegovy isn't working?

Not at all. Digestive side effects do not indicate whether the medication is more or less effective.

During Wegovy's main clinical trial, gastrointestinal side effects were relatively common among participants.²

A little heartburn is normal. And many people find that symptoms gradually improve as their bodies adapt.

If you're concerned about side effects or finding them difficult to manage, the Semapen clinical team can help review your treatment and provide personalised advice.

Are you taking Wegovy but want more support? When you purchase Wegovy online through Semapen, you get expert clinical support, smart weight tracking and more – all delivered through a powerful smartphone app. To find out if you're eligible today, simply take our quick online consultation.

Sources

1. Novo Nordisk (n.d.) WHAT YOU MIGHT EXPECT WITH WEGOVY®. Retrieved from https://www.wegovy.com/obesity/is-wegovy-right-for-me/safety-side-effects.html

2. Wilding, J.P.H. et al. (2021) "Once-Weekly Semaglutide in Adults with Overweight or Obesity" The New England Journal of Medicine, 384(11) https://doi.org/10.1056/NEJMoa2032183

This article was reviewed and approved by Lujain Alhassan, Bariatric Nutritionist, on 4 July 2026.

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