Does Drinking Carbonated Water Cause Bloating?

Yes, carbonated water can cause bloating for some people. The fizz comes from dissolved carbon dioxide (CO2) gas, and when it hits your stomach, that gas has to go somewhere.

For most people, this feeling is mild and short lived. It usually shows up as a burp, a little fullness, or brief stomach distension right after drinking.

Carbonated water is made by dissolving CO2 gas into plain water under pressure. This creates tiny bubbles and gives the water its sharp, tingly taste.

When you drink it, that dissolved gas travels into your stomach. Once there, it starts to come out of the liquid and turn back into gas.

This gas takes up space in your stomach. That extra space is what creates the feeling of fullness, pressure, or bloating.

Your body deals with this gas mostly by burping. Some of it may also pass further into your gut, where it can cause temporary gassiness or distension lower down.

No, not everyone reacts the same way. How much bloating you feel depends on things like how fast you drink, how much you drink, and your own digestive sensitivity.

• People who drink carbonated water quickly, since fast drinking traps more gas at once
• People with irritable bowel syndrome (IBS), who often report more sensitivity to gas and distension
• People with acid reflux or GERD, since bloating can sometimes worsen reflux symptoms
• People who are not used to carbonated drinks, since regular drinkers may adapt over time

Large, well designed studies specifically testing carbonated water and bloating in humans are limited.

Much of what we know comes from general digestive research and smaller trials, so it's worth treating this as an evolving area of science.

Bloating is not the only story. Some research suggests carbonated water may offer benefits that plain water does not, at least in specific situations.

One study looked at people drinking carbonated water after exercising in the heat.

It found that carbonated water helped ease a drop in blood pressure after exercise and also improved mood state, compared to other drinking conditions.[2]

An older review on mineral waters, including carbonated types, noted potential effects on digestion and overall health, though the authors were careful to point out that evidence quality varies widely across studies.[7]

So while bloating is a real short term effect for some people, carbonated water is not automatically bad for you. The full picture includes both this minor downside and some possible upsides.

Carbonated water is more acidic than still water because of the dissolved CO2.

Research measuring pH levels in bottled waters found that carbonated versions tend to have a lower pH than still water, which could play a role in dental erosion over time.[3]

This is a separate issue from bloating, but it's worth knowing if you drink a lot of sparkling water daily. The acidity is generally mild compared to soda, since carbonated water lacks the sugar and added acids found in soft drinks.

As for hydration, carbonated water still counts as water.

Research on adolescent beverage habits found that overall water intake, including from various beverage types, plays an important role in daily fluid consumption patterns.[1]

Mineral content in water, including hardness, has also been studied for broader health associations, such as one Japanese study linking water hardness to longevity patterns in certain regions.[8] This does not prove carbonated water itself extends life, but it shows mineral composition in drinking water is an active area of research.

If fizzy water tends to leave you feeling bloated, a few simple habits may help lower that effect.

• Sip slowly instead of drinking quickly, to give gas more time to escape before it builds up
• Let the water go a little flat before drinking, which reduces the amount of dissolved CO2
• Drink smaller amounts at a time rather than one large serving
• Avoid drinking it right before lying down, which can make fullness feel more noticeable
• Pay attention to your own pattern, since some people tolerate carbonated water fine while others are more sensitive

If bloating is frequent, severe, or comes with pain, it's worth mentioning to a healthcare provider.

This is especially true if you have a condition like IBS or reflux, since sparkling water may be one of several triggers worth ruling out.