Why Heartburn Happens

Heartburn involves a ring of muscles called the lower esophageal sphincter or LES. It acts like a one-way valve allowing food into the stomach. When the LES stops functioning properly and loosens, strong stomach acid refluxes or backs up into the esophagus, irritating its sensitive lining, which can be painful and uncomfortable. This can cause you to feel a burning sensation in your chest or throat.

What Heartburn Feels Like

One of the classic symptoms of heartburn is the unpleasant sensation of burning inside your body. Generally, this sensation is centered around your chest and throat where your stomach acid is most active and can do the most damage. You might also have this weird, acidic taste in your mouth that’s unpleasant and surely doesn’t mix well with the chocolate cake you’re trying to eat for your cousin’s birthday.

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How To Treat Your Heartburn Symptoms?

There are many types of heartburn treatments to take depending on your heartburn symptoms. See what heartburn relief is right for you and your type of heartburn.

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^ IQVIA ProVoice Survey, 2005-2025.

†Pharmacy Times 2025-2026 Survey of Pharmacists’ OTC Recommendations

* Zero heartburn is possible with Prilosec OTC. Not for immediate relief. Take one pill per day as directed to treat frequent heartburn. May take 1 to 4 days for full effect. Do not take for more than 14 days or more often than every 4 months unless directed by a doctor. Use as directed.

** PG Calculation based in part on Buying Households reported by the Nielsen Company through its Homescan Panel service in the US for Prilosec OTC for the period of 8/31/03 through 6/25/16