Constipation is one of the most common digestive complaints worldwide, affecting roughly 10% to 12% of adults at any given time when measured by strict clinical criteria. That number climbs significantly higher when you include people who consider themselves constipated but don’t meet a formal diagnosis. By some estimates, nearly one in four adults has dealt with constipation at some point.
Global Prevalence by the Numbers
A large systematic review published in The Lancet Gastroenterology & Hepatology pooled data from studies across multiple countries and found that functional constipation affects about 10% of the global population. The exact figure shifts depending on which diagnostic criteria researchers use, ranging from about 10% to 15%. A joint guideline from the American Gastroenterological Association and American College of Gastroenterology puts the U.S. figure at 8% to 12% of adults for chronic constipation specifically.
These numbers likely undercount the true burden. In a large internet-based survey, 28.4% of respondents said they considered themselves constipated. When researchers applied clinical diagnostic criteria to those same respondents, about 28% qualified under one set of criteria but only 10% under a stricter definition. The gap between how people experience constipation and how doctors define it is substantial. Roughly half the people who call themselves constipated meet the most commonly used clinical threshold.
Women Are Affected Twice as Often
Constipation is not evenly distributed across the population. Women report it about twice as often as men: 19.7% of women compared to 10.6% of men in one detailed demographic analysis. After adjusting for other factors, women still had roughly double the odds of experiencing constipation. Hormonal fluctuations, particularly progesterone’s effect on slowing gut movement, are a major reason for this gap. Pregnancy amplifies the difference further.
Age Patterns May Surprise You
There’s a common assumption that constipation is mainly a problem for older adults. The data tells a more nuanced story. In one study that broke prevalence down by age group, the highest rate was actually among younger adults aged 18 to 38, at 23.5%. The middle-aged group (39 to 54) came in at 13.3%, and adults 55 to 80 had the lowest rate at 9.9%.
This doesn’t mean older adults are unaffected. Constipation in seniors is more likely to become chronic and is often driven by medications, reduced mobility, and changes in diet and fluid intake. But the idea that constipation is primarily an aging problem doesn’t hold up. Younger adults, particularly younger women, deal with it at surprisingly high rates, possibly due to stress, dietary habits, and hormonal cycles.
Constipation During Pregnancy
About one in three pregnant women experiences constipation at some point during pregnancy, with a global prevalence of 32.4%. The pattern varies by trimester. The first trimester has the lowest rate at 21.1%, the second trimester peaks at 34%, and the third trimester sits at 30.3%. Rising progesterone levels slow the muscles of the digestive tract, and the growing uterus puts physical pressure on the intestines. Iron supplements, commonly prescribed during pregnancy, can worsen things further.
Children Get It Too
Functional constipation in children has an estimated worldwide prevalence of about 3%. While that sounds modest compared to adult figures, it represents millions of children and is one of the most frequent reasons parents bring a child to a pediatrician or pediatric gastroenterologist. In kids, constipation often starts during toilet training, after dietary changes, or following an episode of painful stool that leads to deliberate withholding. Left unaddressed, it can become a self-reinforcing cycle that persists for months or years.
Chronic Versus Occasional
There’s an important distinction between a few days of difficulty and chronic constipation. Almost everyone experiences a short bout of constipation at some point, triggered by travel, a change in routine, dehydration, or a temporary shift in diet. These episodes resolve on their own and don’t require much intervention beyond drinking more water and eating fiber-rich foods.
Chronic constipation is a different category. It involves symptoms lasting at least three months: infrequent bowel movements (typically fewer than three per week), straining, a sensation of incomplete emptying, or hard and lumpy stools. The 8% to 12% prevalence figure for the U.S. refers to this chronic form. In one population-based survey of nearly 20,000 adults, 24% of those who reported any constipation met the clinical criteria for chronic constipation. That means roughly three out of four people who experience constipation are dealing with occasional episodes rather than a persistent condition.
Geographic Variation
Constipation rates vary meaningfully between countries and regions, even when researchers use the same diagnostic criteria everywhere. This suggests that diet, physical activity levels, cultural attitudes toward bowel habits, and possibly genetic factors all play a role. Populations with higher fiber intake and more physically active lifestyles tend to report lower rates, though the research hasn’t pinpointed a single dominant factor. The variation also means that any single prevalence number is an average that may not reflect what’s typical in your specific country or community.
What Helps
For most people with constipation, the first line of relief is straightforward. Increasing dietary fiber through whole grains, fruits, vegetables, or a fiber supplement is the most widely recommended starting point. Staying well hydrated and getting regular physical activity both support more consistent bowel function. Over-the-counter osmotic laxatives, which work by drawing water into the intestines, carry strong recommendations from gastroenterology guidelines for people who don’t get enough relief from fiber alone.
Stimulant laxatives, which trigger the intestinal muscles to contract, are recommended for short-term use or as occasional backup. For people whose constipation doesn’t respond to these approaches, several prescription options exist that work through different mechanisms, either increasing fluid secretion in the gut or stimulating the nerves that drive intestinal movement. The key point is that chronic constipation has a clear treatment ladder, and most people find relief without needing to move past the first few steps.