Gallstones do not directly cause constipation in most cases. The classic symptoms of gallstones are upper abdominal pain, nausea, and vomiting, not changes in bowel habits. However, there are several indirect ways that gallstones and their treatment can lead to constipation, which is why so many people notice the two occurring together.
How Bile Affects Your Bowel Movements
To understand the connection, it helps to know what bile actually does in your gut. Your liver produces bile acids, which get stored in the gallbladder and released into the intestines after you eat. These bile acids do more than help digest fat. They also stimulate your colon to contract and push stool along, and they draw water into the colon to keep stool soft. In animal studies, mice that lacked the receptor bile acids activate in the colon had slower transit, less frequent bowel movements, and drier stool.
When gallstones block the duct that carries bile from the gallbladder to the intestines, less bile reaches the colon. That reduced delivery can slow things down. Research has found that about 15% of people with constipation-predominant irritable bowel syndrome had measurably lower levels of bile acids in their stool compared to healthy controls. So while gallstones themselves aren’t squeezing your colon shut, the disruption they cause to bile flow can meaningfully change how your bowels work.
The Typical Symptoms of Gallstones
Many gallstones cause no symptoms at all. When they do, the hallmark is biliary colic: sudden, intensifying pain in the upper right abdomen or just below the breastbone, sometimes radiating to the back between the shoulder blades or into the right shoulder. Episodes can last anywhere from a few minutes to several hours. Nausea and vomiting are common. Constipation is not part of this classic picture, which is why doctors don’t typically think of gallstones when a patient reports constipation alone.
Why Constipation Often Shows Up Anyway
Dietary Changes
Reducing fat intake is usually the first recommendation when gallstones are causing problems. A low-fat diet can ease gallbladder attacks, but it also changes how much bile your body releases. Less dietary fat means less bile secretion, and less bile in the colon means slower motility and harder stool. If you’ve cut fat significantly without increasing fiber and water intake, constipation is a predictable result.
Pain Medications
Gallstone pain is often treated with opioid-based painkillers like codeine, tramadol, or stronger options. Opioid receptors are densely distributed throughout the gastrointestinal tract, and activating them increases fluid absorption in the colon while slowing motility. Opioid-induced constipation is formally defined as fewer than three bowel movements per week, harder stool, increased straining, or a feeling of incomplete evacuation after starting opioid therapy. Even tramadol, often considered a milder option, slowed colon transit by about 40% in one crossover study of healthy volunteers.
Reduced Physical Activity
Severe or recurring gallstone pain can limit how much you move around. Physical activity helps stimulate the natural contractions of your intestines, so spending more time resting or avoiding movement because of pain can slow your digestion enough to cause constipation.
Constipation After Gallbladder Removal
If you’re experiencing constipation after a cholecystectomy (gallbladder removal surgery), you’re not alone. UNC School of Medicine lists constipation as a common post-operative issue, pointing to three main contributors: the effects of general anesthesia on gut function, decreased physical activity during recovery, and narcotic pain medications prescribed after surgery. Most patients feel well enough to return to work within one to two weeks, but full digestive recovery can take longer.
Increasing fiber intake as soon as you’re able, drinking more fluids, and taking a mild laxative if needed are the standard recommendations during this period. For most people, post-surgical constipation resolves as they wean off pain medications and return to normal activity levels. Some people, however, develop longer-lasting changes in bowel habits after their gallbladder is removed. Without the gallbladder to regulate bile release, bile drips continuously into the intestines rather than being released in controlled bursts after meals. This can swing in either direction: some people develop chronic loose stools, while others experience ongoing constipation.
Gallstone Ileus: A Rare but Serious Exception
In rare cases, a gallstone can directly cause a bowel obstruction. This happens when a large stone erodes through the gallbladder wall into the intestine and physically blocks it, a condition called gallstone ileus. It accounts for only 1% to 4% of all small bowel obstructions. Symptoms go well beyond constipation: severe abdominal pain, bloating, vomiting, and a complete inability to pass stool or gas. This is a surgical emergency, not something that would be confused with ordinary constipation.
Gallstones vs. IBS
There’s meaningful overlap between gallstone symptoms and irritable bowel syndrome, which can make it tricky to pinpoint what’s causing your digestive issues. Bloating, abdominal pain, and changes in bowel habits appear in both conditions. In one population-based study tracking patients after biliary events, those who had gallbladder surgery for gallstones showed new IBS symptoms afterward, though constipation-predominant IBS was less common (about 4.5% of that group) than diarrhea-predominant IBS (about 13.6%).
If you’re dealing with ongoing constipation alongside upper abdominal pain, it’s worth considering whether both a gallbladder issue and a functional bowel problem might be at play. Treating gallstones alone may not resolve constipation if IBS or another motility issue is also contributing.