Soda does not help with heartburn. It actually makes it worse. Carbonated beverages relax the muscular valve between your stomach and esophagus, making it easier for acid to flow upward. The American College of Gastroenterology specifically recommends avoiding carbonated drinks as part of managing reflux.
Why Soda Makes Heartburn Worse
The key problem is carbonation. When you drink something fizzy, the gas expands your stomach. That expansion triggers the valve at the top of your stomach (called the lower esophageal sphincter) to relax and open briefly. In a study of healthy volunteers, drinking a carbonated beverage cut the resting pressure of that valve by more than half, dropping from a median of 40.5 mmHg to 18.5 mmHg. A weaker valve means less protection against acid splashing up into your esophagus.
Carbonation also increased the number of times that valve spontaneously relaxed. After drinking a carbonated beverage, participants experienced a median of 10.5 relaxation events compared to just 1 after drinking plain water. Each of those relaxations is an opportunity for stomach acid to escape upward and cause that burning sensation.
Soda Is Also Highly Acidic on Its Own
Beyond the carbonation issue, most sodas are themselves very acidic. Coca-Cola Classic has a pH of 2.37, and Pepsi comes in at 2.39. For reference, your stomach acid sits around pH 1.5 to 3.5, so these drinks are already in a similar acidic range. Even lemon-lime sodas like Sprite and 7Up, which people sometimes reach for when they feel sick, have a pH around 3.24. Pouring acidic liquid into an already irritated esophagus is unlikely to bring relief.
Caffeinated sodas add another layer of trouble. Caffeine is a known reflux trigger that can further relax the esophageal valve and stimulate acid production. So a caffeinated cola combines three separate heartburn triggers: carbonation, acidity, and caffeine.
What the Long-Term Data Shows
A large prospective study tracking tens of thousands of women found that those who drank six or more servings of soda per day had a 29% higher risk of developing reflux symptoms compared to non-drinkers. Replacing just two daily servings of soda with water was associated with an 8% reduction in reflux risk. Coffee and tea showed similar patterns, but soda showed the strongest benefit from substitution with water.
The Baking Soda Confusion
Some people confuse “soda” the drink with baking soda, which is sodium bicarbonate. These are completely different things. Baking soda is a base that genuinely neutralizes stomach acid. Dissolving half a teaspoon in a glass of cold water can provide short-term heartburn relief. It works the same way an antacid tablet does.
That said, baking soda is a temporary fix. It shouldn’t be used for more than two weeks at a stretch, and it delivers a significant dose of sodium, which matters if you’re watching your salt intake. It also won’t address the underlying cause of frequent heartburn.
Drinks That Actually Help
If you’re dealing with heartburn right now, plain water is your simplest option. It dilutes stomach acid and helps wash any acid in your esophagus back down without introducing carbonation or additional acidity.
Chamomile tea may ease digestive discomfort by relaxing the smooth muscles of the digestive tract, helping reduce bloating and gas. It also has mild anti-inflammatory properties that can calm an irritated stomach lining. Drink it warm, not hot, since very hot liquids can aggravate an already sensitive esophagus.
Aloe vera juice is another option with some evidence behind it. Research has found it can reduce heartburn, belching, and nausea without significant side effects, likely by lowering inflammation and dialing back acid production. Look for versions specifically labeled for drinking, as some aloe products contain compounds that act as laxatives.
Lifestyle Changes That Reduce Heartburn
Cutting out soda is one piece of a larger picture. The American College of Gastroenterology’s clinical guidelines list several lifestyle modifications that help manage reflux: losing weight if you’re overweight, elevating the head of your bed, avoiding late-night meals, staying upright during and after eating, and limiting foods that commonly trigger symptoms. Those trigger foods include chocolate, coffee, spicy foods, citrus, tomatoes, and high-fat meals, alongside carbonated beverages.
If you notice heartburn mainly after specific meals or at night, tracking what you eat and when can help you identify your personal triggers. Not everyone reacts to the same foods, but carbonation is one of the more consistent culprits because the mechanism is physical, not chemical. Gas stretches the stomach, the valve opens, and acid rises. That sequence plays out regardless of individual sensitivity.