What Causes Constipation in Chinese Medicine?

You have not had a bowel movement in days. You see your doctor, and the advice is a stool softener. That treats the symptom. In Chinese medicine, constipation is a sign of something further upstream, and I usually see two main reasons behind it: stress, and an imbalance of the microbes in your gut that builds heat and dries the stool. Find the reason and you can treat the root.

What causes constipation in Chinese medicine?

In Chinese medicine, constipation has two main causes: stress that disturbs the flow of Qi, and heat in the intestines that dries the stool. A stool softener draws water into the stool so it passes more easily. It does nothing about why the stool stopped moving or why it dried out, so the problem comes back as soon as you stop taking it. Western medicine can be like that. It manages the symptom and leaves the terrain as it was.

Chinese medicine asks a different question: what is the body doing that produces this stool? A patient who is constipated because life is tense looks different from a patient who is constipated because the gut runs hot. The treatment follows the pattern.

I wrote about why laxatives offer only temporary relief in my earlier post on what helps constipation. The rest of this article walks through the two patterns, the research behind each, and what to do about them. If you want help working through your own digestion with my clinical team, Gut Brain Synchrony is where we do that, and your first week is free.

Can stress cause constipation?

Yes. Stress is the most common cause of constipation I see. In Chinese medicine we call it the Liver overacting on the Spleen. In modern terms it means your autonomic tone is poor, so you stay in fight or flight all the time. Nobody stops to have a bowel movement while being chased by a bear, and a body that believes it is always being chased does not prioritise one either.

What does the Liver overacting on the Spleen mean?

In Chinese medicine the Liver is responsible for the smooth, free flow of Qi through the whole body, including the movement of the bowels. The Spleen governs transformation and transport: turning food into usable nourishment and moving what is left down and out. In the Five Phases, the Liver belongs to Wood and the Spleen to Earth, and Wood is meant to keep Earth in check, the way roots hold soil.

Under constant stress, frustration or worry, Liver Qi binds up. Instead of keeping the Spleen in balance, it overacts on it, the way an overgrown tree cracks the ground around it. The Spleen can no longer transport, the movement of the intestines slows, and stool sits. Patients with this pattern often notice their bowels are worse in a hard week and better on holiday.

What does the research say about stress and constipation?

The link between a stressed mind and a stuck bowel shows up clearly in the research. In the Toyama birth cohort, researchers followed 5,540 Japanese adolescents over three years. Those who became persistently irritated were 80% more likely to develop constipation (odds ratio 1.80), and those who became physically inactive were 55% more likely (odds ratio 1.55)^[1]. A systematic review of eleven studies in children found that the majority showed a significant relationship between psychological stress and constipation, with family stress, school stress and stressful life events all playing a part^[2].

The autonomic piece has been measured too. A team at McMaster University refined a heart rate variability measure called the Baevsky stress index to quantify sympathetic, or fight-or-flight, tone. In healthy volunteers they identified a subgroup with higher baseline sympathetic tone and stronger sympathetic reactivity to standing, and they showed significant differences in patients with chronic gastrointestinal motility disorders^[3].

How do you calm the stress pattern?

Stay away from the news, social media and anything else that keeps you stressed. Drink warm water between meals, and go for a gentle walk first thing in the morning. In the Chinese medicine clock, the Large Intestine is most active between 5 and 7 in the morning, so movement at the start of the day works with the body's own timing. Warmth supports the Spleen, which dislikes cold, and a walk moves Liver Qi without forcing anything.

Movement has good evidence behind it. A meta-analysis of nine randomized trials with 680 people found that exercise nearly doubled the chance of improvement in constipation symptoms (relative risk 1.97), and aerobic exercise, which included walking and Qigong, more than doubled it (relative risk 2.42)^[4].

Can candida cause constipation?

Yes. The second cause I see is dysbiosis leading to chronic inflammation. When certain kinds of microbes, such as Candida, overgrow in your intestines, they can lead to a buildup of heat there. That heat dries out the fecal matter in your colon, which leads to constipation.

Modern sequencing shows how far the gut ecosystem shifts in people with chronic constipation. A 2026 study ran whole-metagenome sequencing on stool from 53 people with chronic functional constipation and 48 healthy controls. The constipated group showed coordinated dysbiosis across bacteria, fungi and viruses: health-associated Firmicutes were depleted, Proteobacteria were enriched, and several potentially pathogenic fungal taxa were more abundant. The microbial interaction network was also much denser, a sign of an ecosystem under strain^[5].

How does heat dry out the stool?

In Chinese medicine, heat consumes fluids. When heat accumulates in the Large Intestine, it dries the stool the way a hot day dries a riverbed. The stool becomes hard, dry and difficult to pass, sometimes in small pellets.

The classical formula for this pattern is MaZiRenWan, the Hemp Seed Pill, used in China for more than 2,000 years for constipation with excessive heat^[6][7]. It has now been tested properly. In a double-blind randomized trial of 291 people with functional constipation in Hong Kong, 68% responded to MaZiRenWan after eight weeks compared with 33% on placebo. Eight weeks after treatment stopped, 47.4% of the MaZiRenWan group still had a complete response, against 20.6% on the laxative senna and 17.5% on placebo. MaZiRenWan also sped up colonic transit and reduced straining and the feeling of incomplete evacuation^[7]. A meta-analysis of 17 trials and 1,681 patients confirmed the effect, with a 43% higher complete response rate than placebo (risk ratio 1.43)^[8].

What are the signs of heat constipation?

If you have bad breath all the time and you overheat easily, this could be you. Heat rises, and what is stuck below shows up above. The research on breath bears this out: in a study of 100 people with functional constipation, 82 had halitosis, and the severity of the bad breath tracked the severity of the constipation closely (correlation 0.814). When the constipation was treated, the average odor score fell from 3 to 1^[9].

Other signs I look for in this pattern are a red tongue with a yellow coating, thirst, a preference for cold drinks, and dark urine.

Is colon cancer rising in young people?

Yes, and the heat and dysbiosis behind this kind of constipation are one of the reasons colon cancer is trending younger. The incidence of colorectal cancer diagnosed before age 50 has been increasing around the world, particularly in high-income countries^[10][11]. Researchers at Harvard point to exposures such as a Western-style diet, obesity, physical inactivity and antibiotic use, and note that these exposures affect the gut microbiota and host immunity as well as the cells of the colon itself^[10].

Constipation shows up in this picture too. A 2026 case-control study compared 684 adults aged 20 to 49 diagnosed with early-onset colorectal cancer against 1,368 matched controls. Constipation was one of the factors significantly associated with higher odds of the diagnosis, alongside abdominal pain, rectal bleeding and iron deficiency anemia^[12].

What should I eat to relieve constipation?

Eat more cooked vegetables and stay hydrated. You need both fiber and water for the good flora to grow, and that is what clears the heat and gets you going again. Cooked vegetables give the Spleen fiber in a form that is warm and already softened, so it can be transformed without effort. Raw, cold food asks more of a digestion that is already struggling.

Fiber is food for your microbes. A systematic review of 17 randomized trials in healthy adults found that diets providing dietary fibers and plant compounds enriched beneficial bacteria including Akkermansia, Bacteroides, Faecalibacterium, Roseburia and Ruminococcus, with effects on the metabolites they produce and on markers of gut health^[13]. Whole foods work in constipation specifically: a 2023 meta-analysis found that fruit produced more bowel movements than psyllium (0.36 more per week), rye bread did better than white bread (0.43 more per week), and mineral-rich water raised the response rate by 47% compared with low-mineral water^[14].

How to relieve constipation with Chinese medicine

Here is the practical version of the video. Start with the cause that sounds most like you, and do all five if both fit.

Then watch the signs. If the bad breath fades and you stop running hot, the heat is clearing. If your bowels improve on calm days and stall on stressful ones, the stress pattern is the one to keep working on.

Frequently asked questions

Can stress cause constipation for weeks?

Yes. As long as the stress continues, the Liver keeps overacting on the Spleen and the bowel stays sluggish. Lowering the stress inputs and adding a morning walk are the first steps.

Does hot water help constipation?

Warm water between meals helps. In Chinese medicine, cold slows the Spleen and warmth supports it, so a cup of warm water through the day helps the intestines move.

Why can't I poop without laxatives?

Because a stool softener or laxative moves the stool without changing the reason it stopped moving. If stress has your nervous system locked in fight or flight, or dysbiosis has built heat in your intestines, the constipation returns as soon as the laxative stops. Treating the pattern is how you get the bowel working on its own again.

Constipation is a message from your terrain, and when you read it correctly it tells you exactly where to start.

— Brehan Crawford, L.Ac.

References

1. Yamada M, Sekine M, Tatsuse T, Fujimura Y. Lifestyle, psychological stress, and incidence of adolescent constipation: results from the Toyama birth cohort study. BMC Public Health. 2021;21(1):47. doi:10.1186/s12889-020-10044-5
2. Gozali FS, Febiana B, Putra IGNS, Karyana IPG, Hegar B. Relationship between psychological stress with functional constipation in children: a systematic review. Pan Afr Med J. 2023;46:8. doi:10.11604/pamj.2023.46.8.41130
3. Huizinga JD, Chen JH, Hussain A, et al. Determining autonomic sympathetic tone and reactivity using Baevsky's stress index. Am J Physiol Regul Integr Comp Physiol. 2025;328(5):R562-R577. doi:10.1152/ajpregu.00243.2024
4. Gao R, Tao Y, Zhou C, et al. Exercise therapy in patients with constipation: a systematic review and meta-analysis of randomized controlled trials. Scand J Gastroenterol. 2019;54(2):169-177. doi:10.1080/00365521.2019.1568544
5. Sun W, Li Y, Su J, et al. Multi-kingdom metagenomic characterization of the gut bacteriome, mycobiome, and virome in chronic functional constipation. Front Cell Infect Microbiol. 2026;16:1744020. doi:10.3389/fcimb.2026.1744020
6. Cheng CW, Zhang L, Zhao C, et al. Whether syndrome differentiation affects treatment result: study protocol of MaZiRenWan for functional constipation in a randomized controlled trial. Chin J Integr Med. 2019;25(3):175-181. doi:10.1007/s11655-018-2848-y
7. Zhong LLD, Cheng CW, Kun W, et al. Efficacy of MaZiRenWan, a Chinese herbal medicine, in patients with functional constipation in a randomized controlled trial. Clin Gastroenterol Hepatol. 2019;17(7):1303-1310.e18. doi:10.1016/j.cgh.2018.04.005
8. Yang M, Feng Y, Zhang YL, et al. Herbal formula MaZiRenWan (Hemp Seed Pill) for constipation: a systematic review with meta-analysis. Phytomedicine. 2021;82:153459. doi:10.1016/j.phymed.2021.153459
9. Qian XX. Management of functional constipation-associated halitosis: a retrospective study. J Breath Res. 2024;18(4). doi:10.1088/1752-7163/ad63c4
10. Akimoto N, Ugai T, Zhong R, et al. Rising incidence of early-onset colorectal cancer: a call to action. Nat Rev Clin Oncol. 2021;18(4):230-243. doi:10.1038/s41571-020-00445-1
11. Patel SG, Karlitz JJ, Yen T, Lieu CH, Boland CR. The rising tide of early-onset colorectal cancer: a comprehensive review of epidemiology, clinical features, biology, risk factors, prevention, and early detection. Lancet Gastroenterol Hepatol. 2022;7(3):262-274. doi:10.1016/S2468-1253(21)00426-X
12. Castro SA, Husa RA, Vita A, et al. Uncovering the red flags: a cross-sectional retrospective case-control study on predictors of early-onset colorectal cancer in a multistate community health system. Cancer Prev Res (Phila). 2026;19(2):93-106. doi:10.1158/1940-6207.CAPR-25-0232
13. Hindle VK, Veasley NM, Holscher HD. Microbiota-focused dietary approaches to support health: a systematic review. J Nutr. 2025;155(2):381-401. doi:10.1016/j.tjnut.2024.10.043
14. Van Der Schoot A, Katsirma Z, Whelan K, Dimidi E. Systematic review and meta-analysis: foods, drinks and diets and their effect on chronic constipation in adults. Aliment Pharmacol Ther. 2024;59(2):157-174. doi:10.1111/apt.17782