Medically Reviewed

Does Coffee Cause Bloating?

For some, enjoying a cup of coffee can be overshadowed by bloating. We'll delve into the science to find out if there’s a real link between the two.

Coffee is a beloved beverage for many people worldwide. With its invigorating aroma and rich taste, it is no surprise that coffee is the second most consumed drink in the world, after water. However, for some coffee drinkers, the experience of enjoying a cup of coffee can be overshadowed by bloating and other digestive discomforts. This has led to a common belief that coffee may be a culprit of bloating, though whether or not there’s any truth to this remains to be seen. Here we delve into the science behind coffee and bloating to find out if there is a real link between the two.

What is bloating?

Described as a feeling of fullness, tightness, or swelling in the abdomen, bloating is one of the more common digestive issues people experience on a regular basis. It occurs when excess gas accumulates in the gastrointestinal tract, causing the stomach and intestines to expand. While occasional bloating is usually a benign symptom, it can be distressing and interfere with daily activities. If experiencing chronic digestive symptoms please talk to your doctor as it can be a sign of other digestive issues.

What causes bloating?

There are a variety of factors that can contribute to bloating, including temporary constipation (associated with traveling or dietary changes), food intolerances, and hormonal changes. Yet, one of the main culprits of bloating is an imbalance of gut microbes. The gut is home to trillions of microbes that help break down food and extract nutrients. When the balance of these microbes is disturbed, it can lead to an increase in gas production, which in turn causes bloating. Factors such as a diet high in processed foods, antibiotics, and stress can all contribute to an imbalance of gut microbes and result in temporary uncomfortable bloating.

In addition to an imbalance of gut microbes, certain foods can also trigger bloating. For example, foods that are high in fiber, such as legumes and cruciferous vegetables, like broccoli and brussel sprouts, can be difficult for some people to digest and lead to bloating. Other common culprits include dairy products, artificial sweeteners, and carbonated beverages. Identifying your individual triggers for bloating can be a helpful step in managing the condition. By avoiding trigger foods and promoting a healthy balance of gut microbes, you can reduce your chances of experiencing bloating and enjoy a happier, healthier digestive system.

Does coffee cause bloating?

While some people may experience bloating after drinking coffee, studies have shown that coffee can actually have a positive impact on gut health. Coffee is naturally rich in polyphenols, which have been shown to positively influence the microbiome of the human digestive tract.

Furthermore, coffee can aid in digestion by stimulating alpha-amylase and gastrin, two compounds in saliva that aid in the breakdown of carbohydrates and stimulate gastric acid secretion, respectively. Coffee has also been found to increase gastric emptying time, which means it stimulates the stomach to empty its contents into the small intestine.

On the other hand, while drinking coffee may decrease bloating for most, for others it can cause upset stomach or a general discomfort in the stomach region. In fact, a study that aimed to measure symptoms of dyspepsia found that there was no significant difference in stomach symptom scores between individuals who drank coffee and those who drank water. This suggests that coffee is not a major cause of stomach upset or bloating in the general population.

Nevertheless, everyone's body reacts differently, and some people may be more sensitive to the effects of coffee than others. The increased gastric secretions and stomach emptying may be triggering in certain individuals. It all depends on how you drink your coffee, some may prefer their coffee black while others may prefer oat milk or cream. Some versions may be more acidic or contain more sugar than others.

Does black coffee cause bloating?

Black coffee is less likely to cause bloating than coffee with other additives, such as cream, milk, or sugar. This is because the added ingredients may contain lactose or other sugars that are difficult for some people to digest, leading to bloating and digestive discomfort.

However, black coffee can still cause bloating in some people due to its high acidity and caffeine content. The high level of acidity can irritate the lining of the stomach and intestines, leading to feelings of discomfort and bloating. People who are sensitive to acidic foods or have pre-existing digestive conditions may be more likely to experience bloating from black coffee.

Does decaf coffee cause bloating?

While it may seem like decaf coffee would be less likely to cause bloating than regular coffee, there is not a significant difference in the effects of decaf coffee on digestion. Like regular coffee, decaf coffee can increase gastric acid secretion, stimulate the digestive process, and promote gastric emptying.

Yet, because decaf coffee contains less caffeine, it may be less likely to cause irritability or other negative effects on the digestive system. While there is no clear evidence that decaf coffee causes bloating, it's possible that it may cause digestive discomfort in some individuals, especially if they are sensitive to caffeine.

What in coffee causes bloating?

Several factors in coffee can contribute to bloating, including overconsumption, dehydration, acidity, and the use of certain additives. Let’s examine each of these in more detail.

Overconsumption of coffee

Overconsumption of coffee is a common cause of bloating and digestive discomfort. The caffeine content can stimulate the digestive system and increase the production of gastric acid, leading to heartburn, acid reflux, and bloating.

It's recommended that individuals consume no more than roughly 400 mg of caffeine per day, which is equivalent to about 4-5 cups of coffee. Beyond this amount, caffeine can have negative effects on the body, including increased heart rate, nervousness, and disrupting sleep.


Dehydration is another factor that can contribute to bloating caused by coffee consumption. Coffee is a diuretic, which means that it is able to increase the body’s urine output. This can lead to a loss of fluids and electrolytes, which can result in dehydration. When the body is dehydrated, it attempts to compensate by holding on to excess water in an effort to prevent further water loss. This can cause bloating and other symptoms such as bowel issues and abdominal discomfort. To avoid dehydration-related bloating, it's important to drink plenty of water in addition to coffee.

Acidity of coffee

The acidity of coffee can also lead to bloating in some individuals. As mentioned earlier, coffee is naturally acidic, and this acid content can be an irritant to the stomach and intestines. Additionally, some people may be more sensitive to the acid content of coffee than others and may experience bloating even with moderate consumption. To reduce the acidity of coffee, some people opt for low-acid coffee blends.

Additives: artificial sweeteners, cream, milk, etc.

Additives such as artificial sweeteners, cream, milk, and flavored creamers are common causes of bloating. Many artificial sweeteners are difficult for the body to digest and can ferment in the gut, leading to gas and bloating. Additionally, cream and milk are high in lactose, which can cause a range of gastrointestinal problems in individuals who are sensitive.

Flavored creamers can also contain certain sweeteners or other ingredients that can contribute to digestion discomfort, such as high fructose corn syrup or artificial flavors. To reduce the risk of bloating caused by coffee additives, it's best to opt for natural sweeteners like honey or maple syrup and to choose non-dairy milk alternatives if lactose intolerance or sensitivity is a concern.

How else does coffee affect the digestive system?

Aside from bloating, coffee may also cause gas and constipation in certain individuals. Let’s break down these two factors and some ways they can be prevented.

Does coffee cause gas?

Yes, coffee can cause gas in some individuals. The caffeine in coffee can stimulate the digestive system and cause the muscles in the colon to contract, leading to the production of gas. Additionally, as mentioned previously, additives such as artificial sweeteners or dairy products can contribute to gas and bloating when consumed with coffee.

Does coffee cause constipation?

Although coffee can have a mild laxative effect on some people due to its ability to stimulate the muscles in the colon, it may result in bowel changes in others. This is because caffeine can act as a diuretic and increase urine output, leading to dehydration and potentially hard stools. If you experience constipation after drinking coffee, it may be helpful to drink plenty of water alongside your coffee to prevent dehydration. Additionally, incorporating more fiber-rich foods into your diet and getting regular exercise can help to promote regular bowel movements.

How to get rid of coffee-related boating?

If you experience bloating after drinking coffee, there are several things you can try to alleviate your symptoms. First, try reducing your overall caffeine intake and monitoring your consumption of other potential triggers, such as dairy products or artificial sweeteners. Additionally, staying hydrated and drinking plenty of water throughout the day can help to prevent dehydration and promote healthy digestion. Incorporating probiotic-rich foods into your diet or taking a probiotic supplement may also help to rebalance the gut microbiome and reduce bloating.

Finally, incorporating gentle exercise, such as walking or yoga into your daily routine can help to promote healthy digestion and alleviate bloating. If your symptoms persist or become severe, it would be helpful to consult with a healthcare professional for further guidance.

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