Constipation: Causes and Natural Solutions for Healthy Digestion

Constipation : causes et solutions naturelles pour retrouver un transit normal

The Nutrition•pro Team
Published in 2026
4 verified scientific sources

Constipation is one of the most common digestive disorders: uncomfortable, sometimes painful, it disrupts daily life. Good news: in the vast majority of cases, a few simple adjustments are enough to get things moving again, without medication. The key is to address the right causes at the right time.

Here, in a clear and evidence-based manner aligned with medical recommendations, is what constipation really is, why it occurs, when it should be a concern, and above all the natural solutions that work, including the fiber best suited to gently regulate transit: blonde psyllium.

Psyllium blond bio en poudre Nutrition•pro, fibre douce pour le transit
★ The gentle fiber that restores transit
Organic Blonde Psyllium (powder)

A soluble fiber that forms a gel, increases stool volume and makes it easier to pass. The natural reflex against constipation, to be taken with a large glass of water.

Transit Soluble Fiber Organic Gentle
Discover blonde psyllium →
In Brief

Constipation is defined as fewer than three bowel movements per week, or hard stools and straining. It's a very common disorder, affecting up to 24% of adults (Krogh, United European Gastroenterol J, 2017). The most common causes are insufficient fiber and water intake, sedentary lifestyle, and holding back. Management always begins with lifestyle changes: more water, more fiber, more movement. Among fibers, blonde psyllium is one of the most effective: its gel increases stool volume and facilitates passage (McRorie, Dig Dis Sci, 2017). Should be taken with plenty of water.

≈24 %
Of adults affected (Krogh 2017)
< 3
Bowel movements per week = constipation
1.5 L+
Of water per day, the basic reflex
2 ways
Psyllium regulates transit

1. What is constipation?

Key Takeaway
Constipation is defined as fewer than three bowel movements per week, or the presence of hard stools, significant straining, and a sensation of incomplete evacuation. It's a very common and usually benign disorder.

Constipation is not simply about bowel movement frequency. Medically, it involves several signs: fewer than three bowel movements per week, hard stools or small pieces, straining during bowel movements, a sensation of blockage or incomplete evacuation. It is one of the most common digestive disorders: affecting approximately 24% of adults (Krogh, United European Gastroenterol J, 2017).

In the vast majority of cases, it is a functional constipation, with no underlying disease, linked to lifestyle and diet (Aziz, Expert Rev Gastroenterol Hepatol, 2020). This is precisely the type on which natural solutions work best.

2. Why are we constipated? The causes

Key takeaway
The most common causes are lack of fiber and water, sedentary lifestyle, holding back, stress, and schedule changes. Certain medications and diseases can also be responsible.

Constipation rarely has a single cause. Most often, several daily factors combine:

  • Too little fiber : modern diets often lack it, yet fiber adds bulk to stools.
  • Not enough water : without hydration, fiber cannot do its job and stools dry out.
  • Sedentary lifestyle : lack of physical activity slows transit.
  • Holding back : ignoring the urge to have a bowel movement, due to lack of time or privacy, disrupts the natural reflex.
  • Stress and schedule changes : travel, time zone shifts, anxiety disrupt transit.
  • Certain medications and diseases : opioids, certain treatments, metabolic disorders (Aziz, Expert Rev Gastroenterol Hepatol, 2020).

Good news: the primary causes, the most common ones, are easily corrected through lifestyle changes.

3. When to consult: warning signs

Key takeaway
Consult if you notice blood in stools, unexplained weight loss, intense pain, recent and unusual constipation, or symptoms that persist despite natural measures.

Constipation is almost always benign, but certain signs warrant prompt medical attention.

See a doctor if

You notice blood in your stools, unexplained weight loss, intense abdominal pain or vomiting, recent and unusual constipation (especially after age 50), alternating constipation and diarrhea, or if your symptoms persist despite natural measures. These situations require medical advice to rule out an underlying cause.

4. Natural daily solutions

Key takeaway
Medical recommendations are clear: before any medication, focus on lifestyle changes. More fiber, more water, more physical activity, and a regular routine without holding back.

Facing functional constipation, learned societies recommend starting with simple measures, which are sufficient in most cases (Krogh, United European Gastroenterol J, 2017):

  • Gradually increase fiber : vegetables, fruits, legumes, whole grains, and a targeted soluble fiber like psyllium.
  • Drink enough water : approximately 1.5 liters of water per day, an essential condition for fiber to work.
  • Move every day : even a daily walk stimulates transit.
  • Respect the urge : go to the bathroom as soon as the need is felt, and establish a routine (often in the morning).

These habits form the foundation. To strengthen them effectively, one fiber stands out for its efficacy-gentleness ratio: blonde psyllium.

5. Psyllium: the fiber that restarts transit

Key takeaway
Blonde psyllium forms a gel that retains water in the colon: it increases stool volume and softens it, which facilitates evacuation without irritating the intestine. EFSA recognizes that it contributes to increased fecal bulk volume.

Blonde psyllium (Plantago ovata) is a particular soluble fiber: when in contact with water, its husk forms a viscous gel that is not fermented and remains intact until it reaches the colon. There, it retains water, increases stool volume and makes it softer and easier to evacuate, without irritating the mucosa (McRorie, Dig Dis Sci, 2017).

This is what distinguishes it from other fibers: rapidly fermented fibers (like inulin) do not have this effect on stools, and insoluble bran can sometimes be harsh. Psyllium, on the other hand, is gentle and regulating : it works equally well for constipation and for overly soft stools (McRorie, J Acad Nutr Diet, 2017). To understand everything about this fiber, consult our complete guide to blonde psyllium.

The reference fiber for transit
Restart transit, gently

Organic blonde psyllium, 100% husk of Plantago ovata, to be mixed in a large glass of water. Simple, natural, non-habit forming.

Discover blonde psyllium →

6. How to use psyllium against constipation

Key takeaway
Start with a small dose, increase gradually up to 5 to 10 g per day, and always drink a large glass of water with each dose. Results typically appear within 12 to 72 hours.
Psyllium in practice
Days 1-3
Start gentlyHalf to one teaspoon per day, to let your transit adapt and avoid bloating.
Then
Build up to 5-10 g per dayOr 1 to 2 teaspoons, in one or two doses.
With each dose
A large glass of waterMix in water, juice or yogurt, drink immediately, then a second glass of water. That's the golden rule.
Patience
Results in 12 to 72 hoursPsyllium works gently, without a harsh "laxative" effect.
If you're new to fiber
Increase very gradually to avoid gas and bloating.
If you are taking medications
Space psyllium at least 2 hours apart, as it can reduce their absorption.
If you want detailed information on doses and usage

7. Mistakes to avoid

Key takeaways
Common pitfalls: increasing fiber without drinking enough water, overusing stimulant laxatives long-term, and expecting results from a single solution. Consistency and hydration matter more than intensity.

A few common mistakes can worsen the situation or delay improvement:

  • Increasing fiber without drinking enough water : without water, fiber can actually block transit. Hydration and fiber always go together.
  • Overusing stimulant laxatives : useful occasionally, they are not meant for prolonged daily use. Natural measures and gentle fibers should be prioritized long-term.
  • Doing everything at once : too rapid an increase in fiber causes bloating. Increase gradually.
  • Getting discouraged too quickly : it takes a few days for transit to readjust. Consistency is key.

For bloating and swollen belly, often associated together, also see our article swollen belly: what to do.

Frequently asked questions

When is constipation diagnosed?

Constipation is generally diagnosed when there are fewer than three bowel movements per week, or in cases of hard stools, significant straining, and a sensation of incomplete evacuation. It is a very common condition, affecting up to approximately 24% of adults (Krogh, United European Gastroenterol J, 2017).

What are the main causes of constipation?

Most often: lack of fiber and water, sedentary lifestyle, holding back or ignoring the urge, stress, travel, and changes in routine. Certain medications and conditions can also be involved (Aziz, Expert Rev Gastroenterol Hepatol, 2020).

What natural solutions are there for constipation?

The basic measures, recommended first, are to gradually increase fiber intake, drink sufficient water, move more, and not hold back. A soluble fiber such as blonde psyllium is particularly useful for gently stimulating transit (Krogh, 2017).

Is psyllium effective for constipation?

Yes. Blonde psyllium forms a gel that retains water in the colon, increases stool volume, and makes stools softer and easier to evacuate (McRorie, Dig Dis Sci, 2017). EFSA recognizes that it contributes to increased fecal bulk. It must be taken with plenty of water.

How long before psyllium works?

The effect typically appears within 12 to 72 hours. Start with a small dose, increase gradually, and accompany each dose with a large glass of water for optimal and comfortable results.

When should you see a doctor for constipation?

Consult if you have blood in your stools, unexplained weight loss, severe abdominal pain, recent and unusual constipation, or if symptoms persist despite natural measures. These signs require medical advice.

Glossary
Functional constipation
Constipation without underlying disease, related to lifestyle and diet.
Intestinal transit
Movement of food and waste along the digestive tract until evacuation.
Soluble fiber
Fiber that dissolves in water and forms a gel, such as psyllium, gentle on the intestine.
Mucilage
Soluble fiber that swells upon contact with water to form a viscous gel.
Stimulant laxative
Medication that forces intestinal contractions, reserved for occasional use.
Scientific sources
  1. Krogh K, Chiarioni G, Whitehead W. Management of chronic constipation in adults. United European Gastroenterol J 2017;5(4):465-472. DOI : 10.1177/2050640616663439
  2. Aziz I, et al. An approach to the diagnosis and management of Rome IV functional disorders of chronic constipation. Expert Rev Gastroenterol Hepatol 2020;14(1):39-46. DOI : 10.1080/17474124.2020.1708718
  3. McRorie JW, Chey WD. Fermented fiber supplements are no better than placebo for a laxative effect. Dig Dis Sci 2017;61(11):3140-3146. DOI : 10.1007/s10620-016-4304-1
  4. McRorie JW, McKeown NM. Understanding the physics of functional fibers in the gastrointestinal tract. J Acad Nutr Diet 2017;117(2):251-264. DOI : 10.1016/j.jand.2016.09.021

Learn more

About this article. Written by the NUTRITION•PRO team based on medical journals and management recommendations indexed on PubMed. This article is informational and does not replace medical advice: if in doubt or if symptoms persist, consult a healthcare professional. Discover our editorial methodology.

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