By Baden Holt, owner and principal practitioner, Geelong Chinese Medicine
Dual AHPRA registration in acupuncture and Chinese herbal medicine. 6 years working in Chinese medicine, 3 years in practice.
Published 8 October 2026. Last updated 8 October 2026.
This article is general education and does not replace advice from your GP. It describes Chinese medicine as a framework for understanding digestion and makes no claim to treat any condition. Blood in the stool, high fever or signs of dehydration need prompt medical care.
Key takeaways
- A meta-analysis of six studies found travellers’ diarrhoea raises the risk of post-infectious IBS 3.35-fold (5.4% versus 1.4%).
- Giardia and other parasites tripled the odds in one Spanish cohort.
- Vomiting during the illness, a high tendency to notice bodily symptoms, and recent life stress predicted who stayed unwell.
- Chinese medicine reads a lasting gut problem after travel as damp that was never fully cleared, which leaves the Spleen weakened.
- Chinese medicine also describes a second layer, where stress disrupts the Liver and Spleen relationship, which mirrors the stress findings above.
- Trial evidence for herbal formulas in infectious diarrhoea is low quality.
Yes. For a minority of travellers, a bout of travellers’ diarrhoea is followed by months or years of bloating, urgency, loose stools or a gut that reacts to everything. In the cohorts studied, between 3% and 10% of travellers with diarrhoea went on to develop post-infectious irritable bowel syndrome. Chinese medicine offers a framework for why this happens.
What does the research say about the link between travellers’ diarrhoea and long-term gut problems?
A meta-analysis of six studies found that travellers’ diarrhoea raised the relative risk of post-infectious IBS to 3.35. Incidence was 5.4% after an episode and 1.4% in travellers who stayed well [1].
Individual cohorts show a range. A Spanish tropical medicine clinic followed 669 travellers with diarrhoea, and 10.2% developed persistent symptoms. Parasitic infection, mostly Giardia, tripled the odds [2]. A German travel clinic found 6.7%, falling to 3.3% a year later [3]. A large European cohort found 3.0% at six months, and the risk climbed with repeated episodes of diarrhoea [4].
Review literature also links travellers’ diarrhoea with reactive arthritis and Guillain-Barré syndrome. Your GP is the right person for those questions [5].
Who is more likely to stay unwell?
The studies point to a mix of body and mind. Vomiting during the illness and a high tendency to notice bodily symptoms predicted who stayed symptomatic in the German cohort [3]. In the European cohort, a stressful life event in the year before travel raised the odds roughly threefold [4]. Stomach cramps, antibiotic use and nausea during the trip also predicted later symptoms in a multicentre study [6].
These findings show an association. The research does not show that the infection causes anxiety, or that anxiety causes the lingering gut problem. Both directions are plausible, and the data cannot separate them yet.
How does Chinese medicine explain a gut that never recovers?
Definition: Spleen (pí, 脾)
In Chinese medicine, the Spleen is the system that turns food and drink into energy and moves fluid through the body [9]. It shares a name with the anatomical spleen and covers a much wider role, centred on digestion.
Think of it as the body’s kitchen. It receives what you eat, extracts what is useful, and sends the rest along. When the Spleen is strong, you feel energised after meals and your stools are formed. When it weakens, the signs include tiredness, bloating, loose stools and a pale tongue with scalloped edges. A weak Spleen also handles fluid poorly, so damp accumulates. Overwork, worry, irregular meals, cold or raw foods and a long illness all burden it.
Definition: Damp (shī, 濕)
In Chinese medicine, damp is fluid that has stopped moving properly and pooled in the body [10]. Picture a wet towel left in a heap: it stays heavy, turns sticky, and takes ages to dry.
Damp shows up as heaviness, sluggishness, bloating, loose or clinging stools, and a thick coating on the tongue. It can arrive from outside, through contaminated food and water or a humid climate, or build from inside when digestion is weak. Because it is heavy and sticky, damp tends to linger, which is why this framework uses it to explain illness that drags on.
In this framework, contaminated food or water carries damp into the body through the mouth. That route bypasses the outer defences, so the damp lands directly in the digestive system.
The acute picture varies. Cold-damp and damp-heat present differently, so two people with the same bug can need different care [11].
Trouble starts when damp is not fully cleared. Lingering damp burdens the Spleen. A weaker Spleen makes more damp, and the cycle sustains itself. This is the Chinese medicine reading of the person who never really got better after a trip: a deficiency in the digestive system sitting underneath the original infection.
Sequence matters in this framework. The classical teaching is to clear what remains before rebuilding, because astringing or tonifying too early can hold a pathogen in place. A practitioner working through a long-standing case would assess how much damp, heat and deficiency is present before choosing a direction.
Why do gut symptoms and anxiety travel together?
Definition: Qi (qì, 氣)
In Chinese medicine, qi is the body’s working energy: the force that moves, warms and protects, and that powers every organ [9]. It has no direct biomedical equivalent, so this article uses it as a descriptive framework.
If the Spleen is the kitchen, qi is the fire under the pot and the movement that carries everything along. Qi comes from the food you eat and the air you breathe, and the Spleen plays a central part in drawing it from your meals. When qi runs low, the signs include tiredness, weak digestion and loose stools. When qi gets stuck, the signs include tension, distension and mood swings that build with stress.
Chinese medicine describes a working relationship between the Liver and the Spleen [9]. The Liver governs the smooth flow of qi, and stress disrupts that flow. When Liver qi stagnates, it presses on a Spleen that is already weak, and digestion suffers. Gut symptoms then worsen under pressure, and pressure feels heavier when the gut is unsettled.
This description fits the research pattern. Stress, vomiting and symptom awareness predict who stays unwell [3][4]. The Chinese medicine model and the epidemiology describe the same loop in different language.
Practitioners in this tradition also see a body that has been unwell in one system for a long time as one that reacts more easily elsewhere. That is a clinical framework for understanding, and trials have not tested it.
What does the evidence say about herbal formulas for infectious diarrhoea?
A systematic review of 12 randomised trials (1,240 patients) found that Gegen Qinlian Decoction added to conventional care improved clinical efficacy and shortened diarrhoea, abdominal pain and fever. The authors rated the quality of evidence as low or very low and called for better trials [7]. My searches turned up little trial evidence for other traditional formulas in this setting.
What can you do before and after a trip?
Pre-travel counselling lowered the odds of persistent symptoms in the Spanish cohort (odds ratio 0.4) [2]. Talk to your GP or a travel clinic before you go.
If gut symptoms last more than a few weeks after you return, ask your GP about stool testing for parasites such as Giardia. Blood in the stool, high fever, severe dehydration or weight loss need prompt medical care.
Frequently asked questions
What is Bali belly?
Bali belly is a common name for travellers’ diarrhoea. Bacteria are the most frequently identified cause [5].
How long does travellers’ diarrhoea usually last?
It is usually acute and self-limited. Up to 3% of patients have symptoms for more than 30 days [8]. Symptoms that continue beyond a few weeks deserve a GP visit.
Can a stomach bug cause anxiety?
Studies show an association between anxiety-related factors and persistent gut symptoms after infection [3][4]. The research cannot yet say which causes which.
Does Chinese medicine treat Bali belly?
Chinese medicine offers a framework for understanding digestive illness. If symptoms are severe or ongoing, see your GP first.
If your gut has never felt the same since a trip, that is worth a conversation.
References
Clinical research
- Schwille-Kiuntke J, Mazurak N, Enck P. Systematic review with meta-analysis: post-infectious irritable bowel syndrome after travellers’ diarrhoea. Aliment Pharmacol Ther. 2015.
- España-Cueto S et al. Post-infectious irritable bowel syndrome following a diagnosis of traveller’s diarrhoea. J Travel Med. 2023.
- Schwille-Kiuntke J et al. Postinfectious irritable bowel syndrome after travelers’ diarrhea, a cohort study. Neurogastroenterol Motil. 2015.
- Pitzurra R et al. Irritable bowel syndrome among a cohort of European travelers to resource-limited destinations. J Travel Med. 2011.
- Connor BA, Riddle MS. Post-infectious sequelae of travelers’ diarrhea. J Travel Med. 2013.
- Chan J et al. Post-infectious irritable bowel syndrome after intercontinental travel: a prospective multicentre study. J Travel Med. 2023.
- Wang F et al. Gegen Qinlian Decoction combined with conventional Western medicine for infectious diarrhea: systematic review and trial sequential analysis. Complement Med Res. 2024.
- Connor BA. Sequelae of traveler’s diarrhea: focus on postinfectious irritable bowel syndrome. Clin Infect Dis. 2005.
Chinese medicine textbook sources
- Maciocia G. The Foundations of Chinese Medicine: A Comprehensive Text. 3rd ed. Churchill Livingstone/Elsevier; 2015. ISBN 978-0-7020-5216-3. Ch. 3 The Vital Substances; Ch. 7 Functions of the Liver; Ch. 9 Functions of the Spleen; Ch. 12 Yin Organ Interrelationships.
- Clavey S. Fluid Physiology and Pathology in Traditional Chinese Medicine. 2nd ed. Churchill Livingstone/Elsevier; 2003. ISBN 978-0-443-07194-2. Ch. 9 Damp: Principles of Treatment.
- Maciocia G. The Practice of Chinese Medicine: The Treatment of Diseases with Acupuncture and Chinese Herbs. 2nd ed. Churchill Livingstone/Elsevier; 2008. ISBN 978-0-443-07490-5. Ch. 29 Diarrhoea.
