Why Am I Always Constipated?

You have probably already read the list. More fiber, more water, more exercise. You may have tried it, and if you are reading this, it probably did not work, or it worked for a week and then stopped.

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So this is the version written for a 16-year-old rather than a 55-year-old, including the part that happens at school.

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Straining and hard lumpy stools count even if you go every day. For teenagers the biggest single cause is probably holding it at school, which 71.4% of high schoolers said they do in a 2026 survey. More fiber, more water, and more exercise have much thinner evidence behind them than their confidence suggests, and none of them is a treatment for constipation you already have. What the guidelines recommend is PEG, taken for months rather than days, alongside going when you get the urge. If you have had this for years, most people in that position have never treated it either.

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First, what actually counts

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The number most people have heard is three. The NIDDK, the US government's institute for digestive diseases, defines constipation as a condition where "you may have fewer than three bowel movements a week."

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NIDDK's page for children uses a lower bar: "fewer than two bowel movements a week." So a 14-year-old going twice a week and a 30-year-old going twice a week are, on paper, in two different categories.

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Frequency is also only one of the criteria, and it is not the most important one. Rome V, the international standard doctors use to diagnose gut disorders, asks adults about straining, lumpy or hard stools, a feeling of being unfinished, a feeling of being blocked, and having to help things along manually, and it only requires two of those to be happening more than a quarter of the time. You can have a bowel movement every single day and still meet the definition of constipation.

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The shape matters more than the count. The Bristol Stool Form Scale, which is the chart your doctor is thinking of even if they never show it to you, runs from type 1 ("separate hard lumps, like nuts (hard to pass)") through type 7 ("watery, no solid pieces, entirely liquid"). Types 1 and 2 are the constipated end. Types 3 and 4, described as "like a sausage but with cracks on the surface" and "like a sausage or snake, smooth and soft," are what you are aiming for.

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And on the daily thing, Cleveland Clinic is blunt: "Having fewer than three bowel movements a week is, technically, the definition of constipation. But how often you poop varies widely from person to person." Their advice is that whatever your own pattern is, it is normal for you, and what matters is a change away from it. Going every three days is not a problem if that is what you have always done and it comes out easily.

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Why "always" is the right word

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Most pages about constipation treat it as an episode, something that happens to you for a few days. For a lot of people it is not.

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Researchers in the Netherlands surveyed 212 children aged 8 to 17 and 149 young adults aged 18 to 29 from the general population, using the same criteria for both groups. Constipation showed up in 15.6% of the children and 22.8% of the young adults, and the difference between the two groups was not statistically significant. It does not fade out when you turn 18.

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About 43% of the constipated children had been dealing with it for more than five years, and 26% of the young adults had had symptoms since childhood.

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Only 27% of the constipated children and 21% of the constipated young adults had received any form of treatment, which is better news than it sounds. Most people in this situation have never actually treated it. They have adjusted to it.

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So if you have been constipated for years rather than for a week, you are in the majority of people asking this question, and the most likely reason it has not improved is that nothing has really been done about it yet.

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The school bathroom thing

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For teenagers this may be the biggest single cause, and it is missing from most general articles on constipation because most of them are written for adults.

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In May 2026, researchers published a survey of 1,000 Dutch children in JAMA Network Open. Among 8-to-12-year-olds, 51.2% reported holding in a bowel movement at school. Among 13-to-16-year-olds, it was 71.4%.

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Hygiene was cited by 84.3% of them, and privacy by 79.3%.

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This is not one odd survey. In Denmark, researchers asked 19,577 children across 252 schools and found that "more than half of the children (50% boys and 60% girls) were dissatisfied with the toilet facilities" and that "one-fourth of the children (28% of girls, 23% of boys) reported avoiding the use of school toilets." They found a correlation between that dissatisfaction, the avoidance, and bladder and bowel symptoms.

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The American Academy of Pediatrics names the behavior directly in its page for parents: "Older children may hold back their stools when away from home (such as camp or school). They may be afraid of or not like using public toilets." Nemours KidsHealth puts the consequence in one sentence: "Ignoring the urge to go makes it harder to go later."

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No study has proven that holding it at school causes constipation. The Dutch researchers say so about their own data, noting that "the diagnosis of constipation was not confirmed (for example by using the Rome IV criteria), but was based on the participants' interpretation." What has been measured is that most high schoolers hold it, that the students who avoid school bathrooms report more bowel symptoms, and that the mechanism connecting the two is well described. Nobody has run the study that closes the loop.

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What holding it actually does

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Rome V describes holding it as a cycle, which is why this gets worse on its own rather than staying where it is. In their words, "the triggering event is most likely the universal instinct to avoid defecation because of pain or social reasons. Because of the withholding, the colonic mucosa absorbs water from the retained fecal mass, and the stools become progressively hard and more difficult to evacuate."

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Your colon's normal job is pulling water out of waste. When you hold stool there, it keeps doing that job. So the longer it sits, the drier and harder it gets, and the more it hurts to pass. Then the next time you feel the urge, there is now a reason to ignore it, because last time hurt.

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The same passage describes where it ends up. The rectum becomes "increasingly distended, resulting in overflow fecal incontinence, loss of rectal sensation, and ultimately, loss of the normal urge to defecate."

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You can train the signal away. Not on purpose, and not permanently, but if you have noticed that you do not really get the urge anymore, or that you only get it when things are already uncomfortable, that is a recognized medical finding and not you imagining it.

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This also explains the weekend pattern that a lot of students describe, where nothing happens Monday through Friday and then everything happens Saturday morning. That pattern is five days of the cycle above, reset by two days of having a bathroom you are willing to use.

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The other things doing it

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Medications you might not connect to it. Cleveland Clinic's list includes "strong pain medicines, like narcotics containing codeine, oxycodone," antidepressants "including selective serotonin reuptake inhibitors (like fluoxetine [Prozac])," "iron pills," and "allergy medications, such as antihistamines (like diphenhydramine [Benadryl])." Iron is the one to know about if you started taking it for heavy periods or for low ferritin, since that is a common prescription for teenage girls and constipation is one of its most common effects.

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Sitting still. In a survey of 26,864 Hong Kong students aged 11 to 18, constipation affected 14.0% of the students getting enough exercise and 19.6% of those who were not. The odds climbed with each additional inactive behavior, up to 1.88 times for students with all three. That is an association rather than proof, and feeling awful may well be what makes people move less, but it is the largest study that exists in your exact age group.

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Stress and sleep. In 929 Chinese university students, a moderate-to-severe sleep disorder carried about three times the odds of functional constipation. In a small Korean study of 104 male college students, the ones with functional constipation scored roughly twice as high on a life-stress scale as matched students without it, with the biggest differences in worry about the future and about money. Small studies, one country each, and cross-sectional, so treat them as a hint rather than a finding.

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Your cycle, if you have one. Cleveland Clinic's Dr. Donald Ford describes it this way: "Progesterone typically promotes constipation, which tends to come around ovulation or a couple of days after." His timing there is mid-cycle, which is not the premenstrual version of this claim that circulates on most health sites.

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The advice you have already heard

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None of the following is bad for you. Each one just has much less evidence behind it than its confidence suggests, so if you have done all of them and nothing happened, you are not doing it wrong.

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Fiber. The only meta-analysis that looked specifically at children and adolescents pooled 9 randomized trials covering 680 kids aged 1 to 18. Its finding: "no statistical significance was observed for bowel movement frequency, stool consistency, therapeutic success, fecal incontinence, and abdominal pain with fiber intake in patients with childhood constipation." That comes from thin evidence rather than from proof that fiber fails. The pediatric societies' current guideline lands in the same place, recommending "age-appropriate water and fiber intake" and finding no evidence for fiber "beyond the recommended daily amounts." Normal, not extra.

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Water. A systematic review searched 1,040 papers on fluid intake and constipation in children and found 11. Of the ones testing whether drinking more helps once you are already constipated, "the few existing articles did not show an advantage of a greater fluid intake in the treatment," and the single proper randomized trial, in 90 children, found no significant difference. Being dehydrated is a cause worth fixing. Drinking extra when you are already hydrated is not a treatment.

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Exercise. The same guideline recommends "normal physical activity" as a good practice statement, which is its label for advice that has no graded evidence behind it, and its line about no evidence beyond normal amounts covers exercise too. The association data above is decent. The proof that adding exercise fixes existing constipation is not there.

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A footstool. The evidence is split. Two small studies found less straining and faster emptying with a squatting posture, both on subjective measures. A randomized trial of 41 adults referred to a specialist clinic for constipation then found that a footstool changed posture exactly as advertised and that "the use of a footstool was not associated with a change in balloon expulsion time." Pediatric specialists still recommend foot support for anyone whose feet do not reach the floor, which is most people on a standard toilet. It costs nothing to try and the evidence is weaker than the marketing.

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What actually has evidence behind it

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Going when you get the urge, even at school. It follows directly from the mechanism above, and it is free. It is also the hardest, since the reason that 71.4% of high schoolers hold it is that school bathrooms are unpleasant and public. Find the bathroom nobody uses. Most schools have one, usually near a gym, a library, a theater, or an upper floor. Go during class rather than during passing period, when it is empty. The urge is strongest within about an hour of eating, which for most students means right after lunch.

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Actual treatment, if it has been going on for a while. For children and teenagers, the European and North American pediatric gastroenterology societies recommend polyethylene glycol (PEG, sold over the counter as MiraLAX and similar), and in their 2026 guideline it is the only laxative with a strong recommendation behind it. Magnesium hydroxide is their suggested alternative "if PEG is not available," and they list lactulose, senna, and bisacodyl as having a role too. The UK's NICE guideline also starts with PEG. For adults, the 2023 joint guideline from the two big American gastroenterology societies makes PEG the only over-the-counter option with a strong recommendation behind it; psyllium, senna, and magnesium got weaker conditional recommendations on low-certainty evidence.

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This is a conversation to have with a doctor or a parent rather than something to start alone off an article, and there are two reasons it is worth having rather than putting off.

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One: this takes longer than you think. NICE tells doctors to keep the maintenance dose going "for several weeks after regular bowel habit is established," which "may take several months," and says "Do not stop medication abruptly: gradually reduce the dose over a period of months." It also notes that "some children may require laxative therapy for several years." If you have tried a laxative for three days and concluded it did not work, that is the standard mistake, and it is what the guidelines are specifically written to prevent.

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Two: diet alone is not the recommended treatment. NICE states it directly: "Do not use dietary interventions alone as first-line treatment for idiopathic constipation." The recommendation is treatment plus behavioral and dietary changes together.

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If you search MiraLAX, you will find parents reporting neurological and behavioral problems in their children. The American Academy of Pediatrics states that "PEG 3350 is safe in infants, toddlers, children and adults and does not cause increased levels of glycol in the body." The FDA-funded study built to check that claim enrolled 158 children at Children's Hospital of Philadelphia, finished in August 2025, and has not published its results. (A lab paper from the same project, which tested its measuring method on five volunteers aged 13 to 17 who were taking PEG 3350, detected two glycols at levels too low to put a number on.)

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What to be careful with

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Laxatives as a weight-loss method. This circulates under the nickname "budget Ozempic," which, as nutrition lecturer Swrajit Sarkar of City St George's, University of London explains, "usually refers to laxatives or stool softeners" and "is in fact not at all related to Ozempic, nor does it contain semaglutide." Laxatives move water, not fat, so the number on the scale moves and nothing else does. If this is part of why you are here, that is worth telling somebody about, and it is a much more common thing to be dealing with than it feels like.

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Detox and "slimming" teas. A previously healthy 51-year-old woman was hospitalized after drinking about two cups a day of an over-the-counter detox tea for four weeks, arriving at the emergency department with a seizure-like episode and a sodium level of 115 mmol/L, which is severely low. She recovered after a stay in intensive care. Her doctors couldn't find a full ingredient list for the tea, and they described her case as one of "a growing number of reports" of dangerously low sodium after detox teas. These are case reports rather than trials, so they show that it can happen, not how often.

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Colon cleanses. No evidence base to speak of, and the pediatric guidelines do not mention them because they are not a medical treatment.

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Probiotics. This one changed recently. The pediatric societies' 2026 guideline suggests two specific products, a three-strain probiotic mix and a multi-strain synbiotic (a probiotic combined with fiber), both on low-certainty evidence, and says that other probiotic products "do not have sufficient evidence" behind them. So a generic probiotic off the shelf is still not something the guideline backs. The fuller version is in what we found about probiotics.

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Your phone. Nobody has shown that scrolling constipates you. What has been measured is that people who bring a phone sit there much longer, and sitting and straining for twenty minutes has its own costs, which is its own article.

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When to see a doctor

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Get checked promptly for any of these, which NIDDK and the pediatric alarm lists agree on: blood in your stool, belly pain that does not let up, vomiting, fever, or losing weight without trying to.

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On how long is too long, even one institution does not fully agree with itself. Cleveland Clinic's main page says to call if constipation "has lasted more than three weeks," while their own colorectal surgeon puts it at "longer than a week" for someone who does not usually get constipated. Pediatric sources tend to say two to three weeks. A few days is ordinary, a few weeks is worth a conversation, and years is worth an appointment even if it feels too minor to make one for.

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Treat severe abdominal pain with major bloating and no bowel movement for a prolonged stretch as a reason to be seen the same day rather than to wait it out.

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You probably do not need blood work. The pediatric societies' 2014 guideline, which covered testing as well as treatment (the 2026 update covers treatment only), states that "routine laboratory testing to screen for hypothyroidism, celiac disease, and hypercalcemia is not recommended in children with constipation in the absence of alarm symptoms." NICE triggers celiac and thyroid testing on faltering growth or on constipation that is not responding to treatment. If a doctor does not order tests, that is following the guideline rather than dismissing you.

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For how constipation fits alongside the other things that go wrong down there, we wrote a guide to what's going on in your gut.

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Sources

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