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Why Your Morning Brew Might Upset Your Stomach

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Published By: Dr. Jeffrey Mark
Date: December 26, 2023

Many coffee lovers ask why their coffee makes their stomach hurt.

As a board-certified gastroenterologist with a passion for effective communication, I'll navigate the complexities of this common concern, providing insights, solutions, and a better understanding of the delicate dance between coffee and your stomach.

Why Does Coffee Make My Stomach Hurt?

acidity problem

For many, the rich aroma of coffee is accompanied by concerns about its acidity. Coffee naturally contains acids, notably chlorogenic acid, which can stimulate stomach acid production.

In this section, we'll unravel the science of how coffee upsets stomach acidity and its potential role in causing stomach issues such as irritation.

Understanding Coffee Acidity:

Coffee owes its distinct taste to a combination of compounds, with acidity being a prominent factor. However, this acidity can be a double-edged sword, especially for those with sensitive stomachs.

Coffee Acidity

The acids in coffee can trigger an increase in stomach acid production, leading to discomfort.

Impact on Sensitive Stomachs:

Individuals with pre-existing gastrointestinal conditions, such as acid reflux or gastritis, may be particularly susceptible to the effects of coffee acidity. The heightened acid levels can exacerbate symptoms and contribute to stomach pain.

Tips for Managing Coffee Acidity:

  1. Choose Low-Acidity Coffee Beans: Opt for coffee beans with lower acidity, such as Arabica beans.
  2. Cold Brewing: Cold brew coffee results in a smoother and less acidic cup, reducing the compounds that contribute to acidity.
  3. Add Milk: The proteins in milk can help neutralize acidity, offering a gentler option for your stomach.


  1. Boekema PJ, Samsom M, van Berge Henegouwen GP, Smout AJ. Coffee and gastrointestinal function: facts and fiction. Scand J Gastroenterol Suppl. 1999;230:35-9.
  2. Schubert ML. Gastric secretion. Curr Opin Gastroenterol. 2015 Nov;31(6):479-85.

Caffeine Sensitivity

Caffeine Sensitivity

Moving beyond acidity, let's delve into the stimulating culprit present in every sip of coffee – caffeine.

While renowned for its ability to kickstart the day, caffeine can pose challenges for those with heightened sensitivity. This may be genetically determined.

Caffeine and Stomach Acid Production: Caffeine, a central nervous system stimulant, prompts the stomach to produce more acid.

The extent of this increase varies from person to person, with some individuals experiencing heightened sensitivity to caffeine's effects on stomach acid levels.

Understanding Individual Variability: Factors such as genetics, overall health, and medication use contribute to the individual variability in caffeine sensitivity.

Recognizing your unique response is essential in addressing potential stomach discomfort.

Practical Tips for Managing Caffeine Sensitivity:

  1. Gradual Reduction: If you suspect caffeine sensitivity, consider gradually reducing your coffee intake to allow your body to adjust.
  2. Choose Low-Caffeine Options: Experiment with coffee varieties and brewing methods that result in lower caffeine content.
  3. Monitor Other Sources: Remember that caffeine is present in various sources, including tea, chocolate, and certain medications. Be mindful of your overall caffeine intake.

Timing Matters (Again): Considering the timing of your coffee consumption is crucial. Drinking coffee on an empty stomach may intensify its impact on stomach acid production.

Pairing your coffee with a small meal can help buffer the acidity.


  1. Nawrot P, Jordan S, Eastwood J, Rotstein J, Hugenholtz A, Feeley M. Effects of caffeine on human health. Food Addit Contam. 2003 Jan;20(1):1-30.
  2. Spiller MA. The chemical components of coffee. Prog Clin Biol Res. 1984;158:91-147.

Coffee Temperature and Volume

Coffee Temperature

As we journey through the nuances of coffee-induced stomach discomfort, let's explore the impact of temperature and volume on your digestive system.

Temperature Matters:

The temperature of your coffee can influence how it affects your stomach. Hot beverages, including coffee, stimulate the production of gastric acid.

If you've experienced increased stomach pain, consider letting your coffee cool a bit before sipping.

Volume of Consumption:

The quantity of coffee consumed in one sitting plays a significant role in stomach discomfort.

Large volumes of liquid can distend the stomach, triggering increased gastric acid production and potentially causing discomfort. Enjoying coffee in moderation is key.

If you are getting stomach after eating popcorn instead of drinking coffee, you can take a look at this post and I'm sure you'll find a lot of interesting things.

Tips for Temperature and Volume Management:

  1. Allow Cooling Time: Give your coffee a few minutes to cool down before sipping to reduce potential irritation caused by hot temperatures.
  2. Opt for Smaller Servings: Instead of consuming one large cup of coffee, consider dividing your coffee into smaller, more frequent servings to manage the volume entering your stomach.

Coffee small servings

Consider Your Brew Method: Certain brewing methods, such as espresso, result in a more concentrated coffee with higher acidity. If you've experienced stomach pain, experimenting with different brewing methods may offer relief.


  1. Cohen S, Booth GH. Gastric acid secretion and lower-esophageal-sphincter pressure in response to coffee and caffeine. N Engl J Med. 1975 Jun 26;292(26):1352-4.
  2. Boekema PJ, Samsom M, van Berge Henegouwen GP, Smout AJ. Coffee and gastrointestinal function: facts and fiction. Scand J Gastroenterol Suppl. 1999;230:35-9.

Coffee and the Digestive Lining

In this segment, we delve into the impact of coffee on the delicate lining of the digestive system and explore strategies to promote stomach health.

Effects on the Digestive Lining: The compounds in coffee, particularly caffeine and certain acids, can potentially irritate the lining of the stomach and intestines.

This irritation may lead to inflammation, contributing to stomach pain or discomfort, especially in individuals with pre-existing gastrointestinal conditions.

Sensitive Stomachs and Inflammation: For those with conditions like gastritis from acid, bile, or a bacteria called Helicobacter pylori, the inflammatory response triggered by coffee can be more pronounced.

Other less common inflammatory conditions include inflammatory bowel disease (IBD). Understanding your individual digestive health is crucial in deciphering whether coffee is a friend or foe to your stomach.

The bacteria which I have discussed above could lead to other health issues like UTI and that's why you must be a little careful while having coffee.

Promoting Stomach Health:

  1. Choose Low-Acidity Coffee: As discussed earlier, selecting coffee with lower acidity can be gentler on the stomach lining.
  2. Consider Decaffeinated Options: Decaffeinated coffee is a suitable alternative for those looking to reduce their caffeine intake. It can be kinder to the digestive system while still offering the comforting taste of coffee.
  3. Stay Hydrated: Drinking water alongside your coffee can help dilute its impact on the digestive lining.
    Stay Hydrated
  4. Listen to Your Body: Pay attention to how your body reacts to coffee. If you notice consistent stomach pain, it might be worthwhile to consult with a gastroenterologist like the Real Gut Doctor to explore potential underlying digestive issues.


  1. Boekema PJ, Samsom M, van Berge Henegouwen GP, Smout AJ. Coffee and gastrointestinal function: facts and fiction. Scand J Gastroenterol Suppl. 1999;230:35-9.
  2. Nieber K. The impact of coffee on health. Planta Med. 2017 Oct;83(13):1256-1263.

Summing Up

As we conclude our exploration into the mysteries of why coffee might cause stomach discomfort, let's summarize our findings and provide practical tips for a more stomach-friendly coffee experience.

  1. Acidity Matters: Coffee's natural acidity can stimulate stomach acid production, potentially causing irritation. Opt for low-acidity beans and consider cold brewing for a smoother cup.
  2. Caffeine Sensitivity: Individual responses to caffeine vary. Gradually reduce caffeine intake if you suspect sensitivity and explore low-caffeine alternatives.
  3. Temperature and Volume: Hot temperatures and large volumes of coffee can contribute to stomach pain. Allow your coffee to cool slightly and consider smaller, more frequent servings.
  4. Digestive Lining Impact: Coffee compounds, especially caffeine, and acids, may irritate the digestive lining. Choose low-acidity or decaffeinated options, stay hydrated, and listen to your body's signals.

Practical Tips for Stomach-Friendly Coffee:

  1. Know Your Body: Understand your individual digestive health and be mindful of any conditions you may have.
  2. Experiment with Brew Methods: Different brewing methods can alter coffee's acidity and concentration. Find a method that suits your stomach.
  3. Hydration is Key: Drink water alongside your coffee to stay hydrated and help mitigate potential irritants.
  4. Consider Decaffeinated Options: If you love the taste of coffee but want to reduce caffeine intake, explore decaffeinated varieties.
  5. Consult a Gastroenterologist (like The Real Gut Doctor): If you consistently experience stomach pain after consuming coffee, seeking professional advice can help identify any underlying digestive issues.


  1. Boekema PJ, Samsom M, van Berge Henegouwen GP, Smout AJ. Coffee and gastrointestinal function: facts and fiction. Scand J Gastroenterol Suppl. 1999;230:35-9.
  2. Nawrot P, Jordan S, Eastwood J, Rotstein J, Hugenholtz A, Feeley M. Effects of caffeine on human health. Food Addit Contam. 2003 Jan;20(1):1-30.

Bonus Tips for a Happy Stomach and a Pleasurable Coffee Experience

In this segment, we'll uncover additional insights from the community, share valuable resources, and offer bonus tips to ensure your coffee journey remains delightful and stomach-friendly.

Community Insights:

  1. Shared Experiences: Many readers have found relief by adjusting coffee strength, experimenting with brewing methods, or choosing specific blends.
  2. Nutritional Considerations: Emphasizing the importance of overall nutrition, some community members highlight the role of a balanced diet in complementing a stomach-friendly coffee routine.
  3. Herbal Alternatives: Exploring caffeine-free options, such as herbal teas or chicory coffee, has been a positive experience for some. These alternatives offer a flavorful substitute without the potential irritants found in traditional coffee.
  4. Professional Guidance: Several community members stress the significance of consulting healthcare professionals, particularly gastroenterologists like The Real Gut Doctor, for personalized advice tailored to individual health needs.

Further Resources:

  1. International Foundation for Gastrointestinal Disorders (IFFGD): Visit IFFGD for in-depth information on various gastrointestinal disorders and conditions.
  2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK): Explore resources on digestive diseases and disorders at NIDDK.
  3. Coffee Research: Stay updated on the latest research regarding coffee and its effects on health at the National Coffee Association.

Frequently asked questions:

What is gastritis?

Gastritis is simply defined as inflammation or irritation of the stomach lining. It describes a broad range of symptoms from nausea to hiccups, vomiting to indigestion, and loss of appetite to upset stomach.

It can be caused by bile, a bacterial infection, medications such as aspirin or alleve, or alcohol.

Gastritis may be erosive meaning there is damage or the loss of the stomach lining or non-erosive with just inflammation of the lining but no significant damage or loss of the stomach lining.

If symptoms persist a medical evaluation should be pursued as gastritis can lead to a stomach ulcer.

Are Certain Types of Coffee Easier on Your Stomach?

Caffeine can be bothersome for some, especially if there is gastritis present already. Switching to decaffeinated coffee may alleviate most of the caffeine issue but even a decaf coffee contains acid. A low-acid coffee may also be helpful.

A light roast coffee or coffee from Arabica beans has a high acid content. Switching to a low-acid dark roast coffee may help decrease levels of gastric acid exposure to the stomach lining.

Can additives to coffee cause digestive problems?

Many people put milk or creamer in the coffee. This is fine unless you have lactose (the sugar in milk) intolerance or have beta-casein sensitivity (the protein in milk or dairy). Switching to oat, soy, or almond milk may be an option.

Take Care, Stay healthy,

Jeffrey Mark, MD

The Real Gut Doctor

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Dr. Jeffrey Mark
With over thirty years of experience, Dr. Mark is a leading expert in holistic gut health. His integrative approach combines conventional medicine, functional and regenerative medicine, and advanced therapies to heal the gut and transform patient health. Holding 5 board certifications, Dr. Mark offers the comprehensive expertise of five medical specialists during each patient visit. He is dedicated to optimizing wellbeing by addressing the gut-related root causes of chronic health issues.
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