Can Drinking Coffee Make You Constipated?

Coffee is generally associated with a lower risk of constipation, not a higher one — research suggests coffee may help stimulate bowel movements.

You drink a cup hoping for energy and end up running for the bathroom. Most people know coffee can get things moving. But somewhere in the back of your mind, you might wonder: could it be doing the opposite?

The short answer is no — and the evidence is fairly clear. A 2024 study found that drinking caffeinated coffee was linked to lower odds of constipation, with no statistically significant connection to increased constipation. Coffee’s reputation as a digestive helper is supported by biology, not just personal experience.

How Coffee Affects Digestion

Coffee works on the digestive system in several ways. The caffeine acts as a stimulant, increasing the contractions of muscles in the GI tract — a process called gut motility. Faster movement through the intestines means less time for stool to sit and harden.

Morning coffee also triggers the gastrocolic reflex, a natural response where the colon gets the signal to move along stool after eating or drinking. It’s the same reflex that makes some people need a bathroom visit after breakfast.

Beyond caffeine, the acids and other compounds in coffee may also play a role. Caffeine can relax the anal sphincter in some people, making it easier to pass what’s already there.

Why The Constipation Myth Sticks

If coffee reliably gets things moving, why do people ask if it causes constipation? Part of it may come from conflating coffee with other things. The beverage you add — milk, cream, or sugary syrups — can affect digestion differently than black coffee does.

• Dairy additions: Milk and cream contain lactose, which can cause bloating and irregularity in people with lactose sensitivity. It’s the dairy, not the coffee.
• Sweeteners: Artificial sweeteners in some coffee creamers can slow digestion for some people or cause gas and discomfort.
• Individual variation: Responses to coffee vary from person to person based on genetics, gut bacteria, and overall diet. Some people feel it works strongly; others notice nothing.
• Dehydration worries: Caffeine has a mild diuretic effect, but the fluid in coffee largely offsets it. Moderate coffee intake isn’t likely to dehydrate you enough to slow the bowels.
• Excessive intake: Drinking very large amounts of coffee could potentially irritate the gut in ways that alter regularity, but standard consumption is not linked to constipation.

Bottom line: if you feel blocked after coffee, look at what’s in the cup besides coffee. The drink itself is generally on your side.

What The Research Shows About Coffee And Motility

The strongest evidence comes from a 2024 study published by the National Institutes of Health. Researchers analyzed data from thousands of participants and found that drinking caffeinated coffee was associated with lower odds of constipation, with no statistically significant link to constipation.

The bowel-stimulating effect of coffee has been observed in multiple studies. Coffee increases gut motility and releases gastrointestinal hormones that support digestion. Sources note that the specific combination of caffeine and other compounds in coffee increases motility hormones, which is why the effect can be so noticeable.

For most people, coffee acts more like a gentle push than a roadblock.

When Coffee Might Not Help

There are a few scenarios where coffee won’t do much for constipation — but note that not helping is different from causing it.

1. Chronic constipation from other causes: If constipation stems from low fiber, dehydration, medication side effects, or an underlying medical condition, coffee alone won’t fix the root problem.
2. Over-reliance: Relying on coffee to produce a daily bowel movement can mask issues like inadequate fiber or water intake. The goal is regularity, not dependence.
3. Dehydration if consumed to excess: Very high caffeine intake can have a mild diuretic effect, though moderate coffee still provides net hydration. Stick to moderate amounts (roughly 3-4 cups per day).

If coffee doesn’t help and you’re still struggling, focus on fiber, hydration, and daily movement before blaming the brew.

Does The Type Of Coffee Matter?

The specific coffee you drink may play a role. One theory is that certain compounds in coffee affect bowel-stimulating qualities. Caffeinated coffee tends to produce a stronger effect than decaf, but both can still trigger the gastrocolic reflex to some degree.

One study showed that caffeine relaxes the anal sphincter, which can make passing stool feel easier. That effect is more pronounced with caffeinated coffee, as Cleveland Clinic notes in its explanation of how coffee acids increase urge — combined with caffeine, the acids in coffee may add to the effect.

If you want the digestive benefit, black coffee — hot or cold — is your best bet.

The Bottom Line

For the vast majority of people, coffee does not cause constipation and may actually help prevent it. The 2024 research, along with established digestive biology, points to coffee as a bowel-friendly drink. If you’re feeling blocked after coffee, check your add-ins and overall hydration before assuming the coffee itself is the problem.

If you’re dealing with persistent constipation that doesn’t respond to coffee, fiber, or lifestyle changes, a gastroenterologist or primary care provider can help pinpoint what’s going on — whether it’s related to medication, a dietary pattern, or something else that needs a closer look.